Podcasts about alfv

Play Episode Listen Later Nov 30, 2022 0:36

First in-situ observation of surface Alfvén waves in ICME flux rope by Anil raghav et al. on Wednesday 30 November Alfv'en waves (AWs) are inevitable in space and astrophysical plasma. Their crucial role in various physical processes, occurring in plasma, has triggered intense research in solar-terrestrial physics. Simulation studies have proposed the generation of AWs along the surface of a cylindrical flux rope, referred to as Surface AWs (SAWs); however the observational verification of this distinct wave has been elusive to date. We report the first textit{in-situ} observation of SAWs in an interplanetary coronal mass ejection flux rope. We apply the Wal'en test to identify them. The Elsa"sser variables are used to estimate the characterization of these SAWs. They may be excited by the movement of the flux rope's foot points or by instabilities along the plasma magnetic cloud's boundaries. Here, the change in plasma density or field strength in the surface-aligned magnetic field may trigger SAWs. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2211.16972v1

waves surface simulation rope aws observation flux situ anil saws arxiv alfv

A Bayesian approach for torque modelling of BeXRB pulsars with application to super-Eddington accretors

Play Episode Listen Later Nov 30, 2022 1:05

A Bayesian approach for torque modelling of BeXRB pulsars with application to super-Eddington accretors by A. S. Karaferias et al. on Wednesday 30 November In this study we present a method to estimate posterior distributions for standard accretion torque model parameters and binary orbital parameters for X-ray binaries using a nested sampling algorithm for Bayesian Parameter Estimation. We study the spin evolution of two Be X-ray binary systems in the Magellanic Clouds, RX J0520.5-6932 and RX J0209-7427, during major outbursts, in which they surpassed the Eddington-limit. Moreover, we apply our method to the recently discovered Swift J0243.6+6124; the only known Galactic pulsating ultra-luminous X-ray source. This is an excellent candidate for studying the disc evolution at super-Eddington accretion rates, for its luminosity span several orders of magnitude during its outburst, with a maximum $L_{rm X}$ that exceeded the Eddington limit by a factor of $sim 10$. Our method, when applied to RX J0520.5-6932 and RX J0209-7427, is able to identify the more favourable torque model for each system, while yielding meaningful ranges for the NS and orbital parameters. Our analysis for Swift J0243.6+6124 illustrates that, contrary to the standard torque model predictions, the magnetospheric radius and the Alfv'en radius are not proportional to each other when surpassing the Eddington limit. Reported distance estimates of this source range between 5 and 7 kpc. Smaller distances require non-typical neutron star properties (i.e. mass and radius) and possibly lower radiative efficiency of the accretion column. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2211.16079v1

application smaller reported galactic modelling ns bayesian torque pulsars arxiv eddington alfv

A Bayesian approach for torque modelling of BeXRB pulsars with application to super-Eddington accretors

Play Episode Listen Later Nov 29, 2022 0:58

A Bayesian approach for torque modelling of BeXRB pulsars with application to super-Eddington accretors by A. S. Karaferias et al. on Tuesday 29 November In this study we present a method to estimate posterior distributions for standard accretion torque model parameters and binary orbital parameters for X-ray binaries using a nested sampling algorithm for Bayesian Parameter Estimation. We study the spin evolution of two Be X-ray binary systems in the Magellanic Clouds, RX J0520.5-6932 and RX J0209-7427, during major outbursts, in which they surpassed the Eddington-limit. Moreover, we apply our method to the recently discovered Swift J0243.6+6124; the only known Galactic pulsating ultra-luminous X-ray source. This is an excellent candidate for studying the disc evolution at super-Eddington accretion rates, for its luminosity span several orders of magnitude during its outburst, with a maximum $L_{rm X}$ that exceeded the Eddington limit by a factor of $sim 10$. Our method, when applied to RX J0520.5-6932 and RX J0209-7427, is able to identify the more favourable torque model for each system, while yielding meaningful ranges for the NS and orbital parameters. Our analysis for Swift J0243.6+6124 illustrates that, contrary to the standard torque model predictions, the magnetospheric radius and the Alfv'en radius are not proportional to each other when surpassing the Eddington limit. Reported distance estimates of this source range between 5 and 7 kpc. Smaller distances require non-typical neutron star properties (i.e. mass and radius) and possibly lower radiative efficiency of the accretion column. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2211.16079v1

application smaller reported galactic modelling ns bayesian torque pulsars arxiv eddington alfv

Connecting Solar Orbiter remote-sensing observations and Parker Solar Probe in-situ measurements with a numerical MHD reconstruction of the Parker spiral

nasa connecting sun observations spiral reconstruction situ psp measurements metis mhd numerical parker solar probe remote sensing arxiv solar orbiter alfv

Play Episode Listen Later Nov 25, 2022 0:54

Connecting Solar Orbiter remote-sensing observations and Parker Solar Probe in-situ measurements with a numerical MHD reconstruction of the Parker spiral by Ruggero Biondo et al. on Friday 25 November As a key feature, NASA's Parker Solar Probe (PSP) and ESA-NASA's Solar Orbiter (SO) missions cooperate to trace solar wind and transients from their sources on the Sun to the inner interplanetary space. The goal of this work is to accurately reconstruct the interplanetary Parker spiral and the connection between coronal features observed remotely by the Metis coronagraph on-board SO and those detected in situ by PSP at the time of the first PSP-SO quadrature of January 2021. We use the Reverse In-situ and MHD Approach (RIMAP), a hybrid analytical-numerical method performing data-driven reconstructions of the Parker spiral. RIMAP solves the MHD equations on the equatorial plane with the PLUTO code, using the measurements collected by PSP between 0.1 and 0.2 AU as boundary conditions. Our reconstruction connects density and wind speed measurements provided by Metis (3-6 solar radii) to those acquired by PSP (21.5 solar radii) along a single streamline. The capability of our MHD model to connect the inner corona observed by Metis and the super Alfv'enic wind measured by PSP, not only confirms the research pathways provided by multi-spacecraft observations, but also the validity and accuracy of RIMAP reconstructions as a possible test bench to verify models of transient phenomena propagating across the heliosphere, such as coronal mass ejections, solar energetic particles and solar wind switchbacks. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2211.12994v1

Connecting Solar Orbiter remote-sensing observations and Parker Solar Probe in-situ measurements with a numerical MHD reconstruction of the Parker spiral

nasa connecting sun observations spiral reconstruction situ psp measurements metis mhd numerical parker solar probe remote sensing arxiv solar orbiter alfv

Play Episode Listen Later Nov 24, 2022 1:04

Connecting Solar Orbiter remote-sensing observations and Parker Solar Probe in-situ measurements with a numerical MHD reconstruction of the Parker spiral by Ruggero Biondo et al. on Thursday 24 November As a key feature, NASA's Parker Solar Probe (PSP) and ESA-NASA's Solar Orbiter (SO) missions cooperate to trace solar wind and transients from their sources on the Sun to the inner interplanetary space. The goal of this work is to accurately reconstruct the interplanetary Parker spiral and the connection between coronal features observed remotely by the Metis coronagraph on-board SO and those detected in situ by PSP at the time of the first PSP-SO quadrature of January 2021. We use the Reverse In-situ and MHD Approach (RIMAP), a hybrid analytical-numerical method performing data-driven reconstructions of the Parker spiral. RIMAP solves the MHD equations on the equatorial plane with the PLUTO code, using the measurements collected by PSP between 0.1 and 0.2 AU as boundary conditions. Our reconstruction connects density and wind speed measurements provided by Metis (3-6 solar radii) to those acquired by PSP (21.5 solar radii) along a single streamline. The capability of our MHD model to connect the inner corona observed by Metis and the super Alfv'enic wind measured by PSP, not only confirms the research pathways provided by multi-spacecraft observations, but also the validity and accuracy of RIMAP reconstructions as a possible test bench to verify models of transient phenomena propagating across the heliosphere, such as coronal mass ejections, solar energetic particles and solar wind switchbacks. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2211.12994v1

On the hysteresis effect in transitions between accretion and propeller regimes

transitions regimes propeller arxiv accretion sercan alfv

Play Episode Listen Later Nov 24, 2022 0:45

On the hysteresis effect in transitions between accretion and propeller regimes by Sercan Çıkıntoğlu et al. on Thursday 24 November Some observations and numerical simulations of disc-magnetosphere interaction show that accretion can proceed in the propeller regime. When the Alfv'en radius is beyond the corotation radius, matter climbs up to the high latitudes where the Alfv'en surface is inside the equilibrium surface and can accrete. We calculate the fraction of the mass flux in the disc that can accrete onto the neutron star depending on the fastness parameter and the inclination angle between rotation and magnetic axis. We find that, for a narrow range of the fastness parameter, the Alfv'en and the equilibrium surfaces intersect at two different critical latitudes. While the system is transiting from the propeller to the accretion regime (the initial rise of an outburst), accretion proceeds from the region above the higher critical latitude. In transitions from the accretion to the propeller regime (decay of the outburst), accretion of matter can proceed from the disc midplane. As a result, the transition from the propeller to the accretion regime occurs at a luminosity higher than the transition from the accretion to the propeller regime. We discuss the implications of our results for spectral transitions exhibited by low-mass X-ray binaries. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2211.12945v1

Generation of solar chromosphere heating and coronal outflows by two-fluid waves

Play Episode Listen Later Nov 24, 2022 1:00

Generation of solar chromosphere heating and coronal outflows by two-fluid waves by M. Pelekhata et al. on Thursday 24 November Context. It is known that Alfv'en and magnetoacoustic waves both contribute to the heating of the solar chromosphere and drive plasma outflows. In both cases, the thermalization of the wave energy occurs due to ion-neutral collisions, but the obtained rates of plasma heating cannot explain the observational data. The same is true for the magnitudes of the outflows. Aims. The aim of the present paper is to reexamine two-fluid modeling of Alfv'en and magnetoacoustic waves in the partially ionized solar chromosphere. We attempt to detect variations in the ion temperature, and vertical plasma flows for different wave combinations. Methods. We performed numerical simulations of the generation and evolution of coupled Alfv'en and magnetoacoustic waves using the JOANNA code, which solves the two-fluid equations for ions (protons)+electrons and neutrals (hydrogen atoms), coupled by collision terms. Results. We confirm that the damping of impulsively generated small-amplitude waves negligibly affects the chromosphere temperature and generates only slow plasma flows. In contrast, waves generated by large-amplitude pulses significantly increase the chromospheric temperature and result in faster plasma outflows. The maximum heating occurs when the pulse is launched from the center of the photosphere, and the magnitude of the related plasma flows increases with the amplitude of the pulse. Conclusions. Large-amplitude coupled two-fluid Alfv'en and magnetoacoustic waves can significantly contribute to the heating of the solar chromosphere and to the generation of plasma outflows. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2211.12898v1

generation large waves solar results methods aims fluid heating conclusions arxiv coronal outflows alfv

On the hysteresis effect in transitions between accretion and propeller regimes

transitions regimes propeller arxiv accretion sercan alfv

Play Episode Listen Later Nov 23, 2022 0:43

On the hysteresis effect in transitions between accretion and propeller regimes by Sercan Çıkıntoğlu et al. on Wednesday 23 November Some observations and numerical simulations of disc-magnetosphere interaction show that accretion can proceed in the propeller regime. When the Alfv'en radius is beyond the corotation radius, matter climbs up to the high latitudes where the Alfv'en surface is inside the equilibrium surface and can accrete. We calculate the fraction of the mass flux in the disc that can accrete onto the neutron star depending on the fastness parameter and the inclination angle between rotation and magnetic axis. We find that, for a narrow range of the fastness parameter, the Alfv'en and the equilibrium surfaces intersect at two different critical latitudes. While the system is transiting from the propeller to the accretion regime (the initial rise of an outburst), accretion proceeds from the region above the higher critical latitude. In transitions from the accretion to the propeller regime (decay of the outburst), accretion of matter can proceed from the disc midplane. As a result, the transition from the propeller to the accretion regime occurs at a luminosity higher than the transition from the accretion to the propeller regime. We discuss the implications of our results for spectral transitions exhibited by low-mass X-ray binaries. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2211.12945v1

Generation of solar chromosphere heating and coronal outflows by two-fluid waves

Play Episode Listen Later Nov 23, 2022 0:52

Generation of solar chromosphere heating and coronal outflows by two-fluid waves by M. Pelekhata et al. on Wednesday 23 November Context. It is known that Alfv'en and magnetoacoustic waves both contribute to the heating of the solar chromosphere and drive plasma outflows. In both cases, the thermalization of the wave energy occurs due to ion-neutral collisions, but the obtained rates of plasma heating cannot explain the observational data. The same is true for the magnitudes of the outflows. Aims. The aim of the present paper is to reexamine two-fluid modeling of Alfv'en and magnetoacoustic waves in the partially ionized solar chromosphere. We attempt to detect variations in the ion temperature, and vertical plasma flows for different wave combinations. Methods. We performed numerical simulations of the generation and evolution of coupled Alfv'en and magnetoacoustic waves using the JOANNA code, which solves the two-fluid equations for ions (protons)+electrons and neutrals (hydrogen atoms), coupled by collision terms. Results. We confirm that the damping of impulsively generated small-amplitude waves negligibly affects the chromosphere temperature and generates only slow plasma flows. In contrast, waves generated by large-amplitude pulses significantly increase the chromospheric temperature and result in faster plasma outflows. The maximum heating occurs when the pulse is launched from the center of the photosphere, and the magnitude of the related plasma flows increases with the amplitude of the pulse. Conclusions. Large-amplitude coupled two-fluid Alfv'en and magnetoacoustic waves can significantly contribute to the heating of the solar chromosphere and to the generation of plasma outflows. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2211.12898v1

generation large waves solar results methods aims fluid heating conclusions arxiv coronal outflows alfv

As a matter of dynamical range -- scale dependent energy dynamics in MHD turbulence

Play Episode Listen Later Nov 21, 2022 1:00

As a matter of dynamical range -- scale dependent energy dynamics in MHD turbulence by Philipp Grete et al. on Monday 21 November Magnetized turbulence is ubiquitous in many astrophysical and terrestrial plasmas but no universal theory exists. Even the detailed energy dynamics in magnetohydrodynamic (MHD) turbulence are still not well understood. We present a suite of subsonic, super-Alfv'enic, high plasma-beta MHD turbulence simulations that only vary in their dynamical range, i.e., in their separation between the large-scale forcing and dissipation scales, and their dissipation mechanism (implicit large eddy simulation, ILES, versus and direct numerical simulation, DNS). Using an energy transfer analysis framework we calculate the effective, numerical viscosities and resistivities and demonstrate and that all ILES calculations of MHD turbulence are resolved and correspond to an equivalent visco-resistive MHD turbulence calculation. Increasing the number of grid points used in an ILES corresponds to lowering the dissipation coefficients, i.e., larger (kinetic and magnetic) Reynolds numbers for a constant forcing scale. Independently, we use this same framework to demonstrate that -- contrary to hydrodynamic turbulence -- the cross-scale energy fluxes are not constant in MHD turbulence. This applies both to different mediators (such as cascade processes or magnetic tension) for a given dynamical range as well as to a dependence on the dynamical range itself, which determines the physical properties of the flow. We do not observe any indication of convergence even at the highest resolution (largest Reynolds numbers) simulation at $2{,}048^3$ cells, calling into question whether an asymptotic regime in MHD turbulence exists, and, if so, what it looks like. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2211.09750v1

energy scale increasing dynamics range reynolds dependent turbulence dns independently iles mhd arxiv dynamical alfv

Våra första år - Barn med docent Tobias Alfvén

Sjuka Fakta

Play Episode Listen Later Oct 18, 2022 68:54

Våra första år kommer vi sällan ihåg, men det är så mycket som händer som är helt avgörande för vårt fortsatta liv. Som förälder eller anhörig vill man göra det som är bäst för barnet och man gör allt för att förstå varenda vink. Men vad är egentligen "bäst"? Vilka beteenden hos barn är skadliga och vilka är en del av lärandet? Stämmer det att det är skadligt med för mycket skärmtid? Gör socker barnen mer hyperaktiva? Blir de gladare i maten om de tidigt får prova på olika smaker? I detta samtal med docent Tobias Alfvén går vi från spädbarn till skolåldern för att få lite bättre koll på våra både yngsta och minsta medborgare. Bli supporter och slipp reklam genom att gå in på https://plus.acast.com/s/sjukafakta. Hosted on Acast. See acast.com/privacy for more information.

men acast barn blir vilka bli frsta docent alfv

Magnetohydrodynamic stability of magnetars in the ultrastrong field regime II: The crust

Play Episode Listen Later Oct 12, 2022 0:45

Magnetohydrodynamic stability of magnetars in the ultrastrong field regime II: The crust by Peter B. Rau et al. on Wednesday 12 October We study the stability of Hall MHD with strong magnetic fields in which Landau quantization of electrons is important. We find that the strong-field Hall modes can be destabilized by the dependence of the differential magnetic susceptibility on magnetic field strength. This instability is studied using linear perturbation theory, and is found to have typical growth time of order $lesssim 10^3$ yrs, with the growth time decreasing as a function of wavelength of the perturbation. The instability is self-limiting, turning off following a period of local field growth by a few percent of the initial value. Finite temperature is also shown to limit the instability, with sufficiently high temperatures eliminating it altogether. Alfv'{e}n waves can show similar unstable behaviour on shorter timescales. We find that Ohmic heating due to the large fields developed via the instability and magnetic domain formation is not large enough to account for observed magnetar surface temperatures. However, Ohmic heating is enhanced by the oscillatory differential magnetic susceptibility of Landau-quantized electrons, which could be important to magneto-thermal simulations of neutron star crusts. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2210.05774v1

field stability regime crust finite landau arxiv magnetars alfv

Direct Emission of Strong Radio Pulses During Magnetar Flares

emission flares pulses arxiv magnetar christopher thompson alfv

Play Episode Listen Later Sep 25, 2022 0:56

Direct Emission of Strong Radio Pulses During Magnetar Flares by Christopher Thompson. on Sunday 25 September The emission of intense radio pulses by flaring magnetars is investigated. Small-scale current gradients can be imprinted into a strongly magnetized outflow by the same processes that source fireball radiation in the closed magnetosphere. This structure arises from a combination of crustal yielding, internal tearing, and turbulent cascade. We consider the quasi-linear development of weak, small-scale currents as (i) they are stretched out and frozen by relativistic expansion and then (ii) pass through a shock. In particular, we derive the amplitudes of the ordinary and fast waves that emerge downstream of a relativistic, magnetized shock in response to a mode that is frozen into the upstream flow (a frozen Alfv'en wave or entropy wave). An upstream mode with comoving wavelength exceeding the skin depth can linearly convert to a secondary mode propagating above the plasma frequency. A simple and accurate treatment of shocks with extreme magnetization is developed, and the formation of internal shocks in the outflow from a bursting, rotating magnetar is outlined. The emission process described here does not require a strong shock or cool $e^pm$ pairs (in contrast with the electromagnetic maser shock instability). In some cases, a high-frequency wave is reflected back to the observer, but with a minuscule amplitude that makes it subdominant to other emission channels. The dominant secondary electromagnetic mode is superluminal at emission, is subject to weak induced scattering within the outflow, and can reach the observer in the radio band. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2209.11136v1

Direct Emission of Strong Radio Pulses During Magnetar Flares

emission flares pulses arxiv magnetar christopher thompson alfv

Play Episode Listen Later Sep 25, 2022 0:46

Direct Emission of Strong Radio Pulses During Magnetar Flares by Christopher Thompson. on Sunday 25 September The emission of intense radio pulses by flaring magnetars is investigated. Small-scale current gradients can be imprinted into a strongly magnetized outflow by the same processes that source fireball radiation in the closed magnetosphere. This structure arises from a combination of crustal yielding, internal tearing, and turbulent cascade. We consider the quasi-linear development of weak, small-scale currents as (i) they are stretched out and frozen by relativistic expansion and then (ii) pass through a shock. In particular, we derive the amplitudes of the ordinary and fast waves that emerge downstream of a relativistic, magnetized shock in response to a mode that is frozen into the upstream flow (a frozen Alfv'en wave or entropy wave). An upstream mode with comoving wavelength exceeding the skin depth can linearly convert to a secondary mode propagating above the plasma frequency. A simple and accurate treatment of shocks with extreme magnetization is developed, and the formation of internal shocks in the outflow from a bursting, rotating magnetar is outlined. The emission process described here does not require a strong shock or cool $e^pm$ pairs (in contrast with the electromagnetic maser shock instability). In some cases, a high-frequency wave is reflected back to the observer, but with a minuscule amplitude that makes it subdominant to other emission channels. The dominant secondary electromagnetic mode is superluminal at emission, is subject to weak induced scattering within the outflow, and can reach the observer in the radio band. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2209.11136v1

Estimating Ion Temperatures at the Polar Coronal Hole Boundary

Play Episode Listen Later Sep 22, 2022 0:53

Estimating Ion Temperatures at the Polar Coronal Hole Boundary by Yingjie Zhu et al. on Thursday 22 September Physical quantities, such as ion temperature and nonthermal velocity, provide critical information about the heating mechanism of the million-degree solar corona. We determined the possible ion temperature $T_i$ intervals using extreme ultraviolet (EUV) line widths, only assuming that the plasma nonthermal velocity is the same for all ions. We measured ion temperatures at the polar coronal hole boundary simultaneously observed in 2007 by the EUV Imaging Spectrometer (EIS) on board the Hinode satellite and the Solar Ultraviolet Measurements of Emitted Radiation (SUMER) on board the Solar and Heliospheric Observatory (SOHO). The temperatures of ions with the charge-to-mass ratio ($Z/A$) less than 0.20 or greater than 0.33 are much higher than the local electron temperature. The measured ion temperature decreases with the $Z/A$ to 0.25 and then increases with the charge-to-mass ratio. We ran the Alfv'en Wave Solar Model-realtime (AWSoM-R) and the SPECTRUM module to validate the ion temperature diagnostic technique and to help interpret the results. We suggest that the widths of hot lines in the coronal hole (e.g., Fe XII, Fe XIII) are also affected by the solar wind bulk motions along the line of sight. We discussed the factors that might affect the line width fitting, including the instrumental width and non-Gaussian wings in some bright SUMER lines that can be fitted by a double-Gaussian or a $kappa$ distribution. Our study confirms the presence of preferential heating of heavy ions in coronal holes and provides new constraints to coronal heating models. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2209.10686v1

hole solar spectrum polar boundary temperatures estimating sumer arxiv gaussian coronal euv hinode alfv

The Effect of the Chromospheric Temperature on Coronal Heating

Play Episode Listen Later Sep 21, 2022 0:43

The Effect of the Chromospheric Temperature on Coronal Heating by Haruka Washinoue et al. on Wednesday 21 September Recent observational and numerical studies show a variety of thermal structures in the solar chromosphere. Given that the thermal interplay across the transition region is a key to coronal heating, it is worth investigating how different thermal structures of the chromosphere yield different coronal properties. In this work, by MHD simulations of Alfv'{e}n-wave heating of coronal loops, we study how the coronal properties are affected by the chromospheric temperature. To this end, instead of solving the radiative transfer equation, we employ a simple radiative loss function so that the chromospheric temperature is easily tuned. When the chromosphere is hotter, because the chromosphere extends to a larger height, the coronal part of the magnetic loop becomes shorter, which enhances the conductive cooling. A larger loop length is therefore required to maintain the high-temperature corona against the thermal conduction. From our numerical simulations we derive a condition for the coronal formation with respect to the half loop length $l_{rm loop}$ in a simple form: $l_{rm loop} > a T_{rm min} + l_{rm th}$, where $T_{rm min}$ is the minimum temperature in the atmosphere and parameters $a$ and $l_{rm th}$ have negative dependencies on the coronal field strength. Our conclusion is that the chromospheric temperature has a non-negligible impact on coronal heating for loops with small length and weak coronal field. In particular, the enhanced chromospheric heating could prevent the formation of the corona. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2209.10156v1

temperature heating mhd arxiv coronal alfv

Turbulent regimes in collisions of 3D Alfvén-wave packets

Play Episode Listen Later Sep 21, 2022 0:40

Turbulent regimes in collisions of 3D Alfvén-wave packets by Silvio Sergio Cerri et al. on Wednesday 21 September Using 3D gyrofluid simulations, we revisit the problem of Alfven-wave (AW) collisions as building blocks of the Alfvenic cascade and their interplay with magnetic reconnection at magnetohydrodynamic (MHD) scales. Depending on the large-scale nonlinearity parameter $chi_0$ (the ratio between AW linear propagation time and nonlinear turnover time), different regimes are observed. For strong nonlinearities ($chi_0sim1$), turbulence is consistent with a dynamically aligned, critically balanced cascade--fluctuations exhibit a scale-dependent alignment $sintheta_kpropto k_perp^{-1/4}$, a $k_perp^{-3/2}$ spectrum and $k_|propto k_perp^{1/2}$ spectral anisotropy. At weaker nonlinearities (small $chi_0$), a spectral break marking the transition between a large-scale weak regime and a small-scale $k_perp^{-11/5}$ tearing-mediated range emerges, implying that dynamic alignment occurs also for weak nonlinearities. At $chi_0

wave dynamic depending collisions aw turbulent regimes packets mhd arxiv alfv

Turbulent regimes in collisions of 3D Alfvén-wave packets

Play Episode Listen Later Sep 21, 2022 0:40

Turbulent regimes in collisions of 3D Alfvén-wave packets by Silvio Sergio Cerri et al. on Wednesday 21 September Using 3D gyrofluid simulations, we revisit the problem of Alfven-wave (AW) collisions as building blocks of the Alfvenic cascade and their interplay with magnetic reconnection at magnetohydrodynamic (MHD) scales. Depending on the large-scale nonlinearity parameter $chi_0$ (the ratio between AW linear propagation time and nonlinear turnover time), different regimes are observed. For strong nonlinearities ($chi_0sim1$), turbulence is consistent with a dynamically aligned, critically balanced cascade--fluctuations exhibit a scale-dependent alignment $sintheta_kpropto k_perp^{-1/4}$, a $k_perp^{-3/2}$ spectrum and $k_|propto k_perp^{1/2}$ spectral anisotropy. At weaker nonlinearities (small $chi_0$), a spectral break marking the transition between a large-scale weak regime and a small-scale $k_perp^{-11/5}$ tearing-mediated range emerges, implying that dynamic alignment occurs also for weak nonlinearities. At $chi_0

wave dynamic depending collisions aw turbulent regimes packets mhd arxiv alfv

On the Statistics of Elsasser Increments in Solar Wind and Magnetohydrodynamic Turbulence

statistics turbulence arxiv solar wind increments elsasser alfv

Play Episode Listen Later Sep 20, 2022 0:49

On the Statistics of Elsasser Increments in Solar Wind and Magnetohydrodynamic Turbulence by Juan C. Palacios et al. on Tuesday 20 September We investigate the dependency with scale of the empirical probability distribution functions (PDF) of Elsasser increments using large sets of WIND data (collected between 1995 and 2017) near 1 au. The empirical PDF are compared to the ones obtained from high-resolution numerical simulations of steadily driven, homogeneous Reduced MHD turbulence on a $2048^3$ rectangular mesh. A large statistical sample of Alfv'enic increments is obtained by using conditional analysis based on the solar wind average properties. The PDF tails obtained from observations and numerical simulations are found to have exponential behavior in the inertial range, with an exponential decrement that satisfies power-laws of the form $alpha_lpropto l^{-mu}$, where $l$ the scale size, with $mu$ around 0.2 for observations and 0.4 for simulations. PDF tails were extrapolated assuming their exponential behavior extends to arbitrarily large increments in order to determine structure function scaling laws at very high orders. Our results points to potentially universal scaling laws governing the PDF of Elsasser increments and to an alternative methodology to investigate high-order statistics in solar wind observations. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2209.09152v1

On the Statistics of Elsasser Increments in Solar Wind and Magnetohydrodynamic Turbulence

statistics turbulence arxiv solar wind increments elsasser alfv

Play Episode Listen Later Sep 20, 2022 0:48

On the Statistics of Elsasser Increments in Solar Wind and Magnetohydrodynamic Turbulence by Juan C. Palacios et al. on Tuesday 20 September We investigate the dependency with scale of the empirical probability distribution functions (PDF) of Elsasser increments using large sets of WIND data (collected between 1995 and 2017) near 1 au. The empirical PDF are compared to the ones obtained from high-resolution numerical simulations of steadily driven, homogeneous Reduced MHD turbulence on a $2048^3$ rectangular mesh. A large statistical sample of Alfv'enic increments is obtained by using conditional analysis based on the solar wind average properties. The PDF tails obtained from observations and numerical simulations are found to have exponential behavior in the inertial range, with an exponential decrement that satisfies power-laws of the form $alpha_lpropto l^{-mu}$, where $l$ the scale size, with $mu$ around 0.2 for observations and 0.4 for simulations. PDF tails were extrapolated assuming their exponential behavior extends to arbitrarily large increments in order to determine structure function scaling laws at very high orders. Our results points to potentially universal scaling laws governing the PDF of Elsasser increments and to an alternative methodology to investigate high-order statistics in solar wind observations. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2209.09152v1

Transition to turbulence in nonuniform coronal loops driven by torsional Alfvén waves II Extended analysis and effect of magnetic twist

Play Episode Listen Later Sep 19, 2022 0:49

Transition to turbulence in nonuniform coronal loops driven by torsional Alfvén waves II Extended analysis and effect of magnetic twist by Sergio Díaz-Suárez et al. on Monday 19 September It has been shown in a previous work that torsional Alfv'en waves can drive turbulence in nonuniform coronal loops with a purely axial magnetic field. Here we explore the role of the magnetic twist. We model a coronal loop as a transversely nonuniform straight flux tube, anchored in the photosphere, and embedded in a uniform coronal environment. We consider that the magnetic field is twisted and control the strength of magnetic twist by a free parameter of the model. We excite the longitudinally fundamental mode of standing torsional Alfv'en waves, whose temporal evolution is obtained by means of high-resolution three-dimensional ideal magnetohydrodynamic numerical simulations. We find that phase mixing of torsional Alfv'en waves creates velocity shear in the direction perpendicular to the magnetic field lines. The velocity shear eventually triggers the Kelvin-Helmholtz instability (KHi). In weakly twisted magnetic tubes, the KHi is able to grow nonlinearly and, subsequently, turbulence is driven in the coronal loop in a similar manner as in the untwisted case. Provided that magnetic twist remains weak, the effect of magnetic twist is to delay the onset of the KHi and to slow down the development of turbulence. In contrast, magnetic tension can suppress the nonlinear growth of the KHi when magnetic twist is strong enough, even if the KHi has locally been excited by the phase-mixing shear. Thus, turbulence is not generated in strongly twisted loops arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2207.06315v2

transition driven waves twist magnetic turbulence loops khi coronal sergio d alfv

Do Periods of Decayless Kink Oscillations of Solar Coronal Loops Depend on Noise?

Play Episode Listen Later Sep 14, 2022 0:51

Do Periods of Decayless Kink Oscillations of Solar Coronal Loops Depend on Noise? by Valery M. Nakariakov et al. on Wednesday 14 September Decayless kink oscillations of solar coronal loops are studied in terms of a low-dimensional model based on a randomly driven Rayleigh oscillator with coefficients experiencing random fluctuations. The model considers kink oscillations as natural modes of coronal loops, decaying by linear resonant absorption. The damping is counteracted by random motions of the loop footpoints and the interaction of the loop with external quasi-steady flows with random fluctuations. In other words, the model combines the self-oscillatory and randomly driven mechanisms for the decayless behaviour. The random signals are taken to be of the stationary red noise nature. In the noiseless case, the model has an asymptotically stationary oscillatory solution, i.e., a kink self-oscillation. It is established that the kink oscillation period is practically independent of noise. This finding justifies the seismological estimations of the kink and Alfv'en speeds and the magnetic field in an oscillating loop by kink oscillations, based on the observed oscillation period. The oscillatory patterns are found to be almost harmonic. Noisy fluctuations of external flows modulate the amplitude of the almost monochromatic oscillatory pattern symmetrically, while random motions of the loop footpoints cause antisymmetric amplitude modulation. Such modulations are also consistent with the observed behaviour. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2209.06343v1

solar periods kink depend loops noisy oscillations arxiv coronal rayleigh alfv

In-situ Observation Of Alfv'en Waves In Icme Shock-Sheath Indicates Existence Of Alfv'enic Turbulence

Play Episode Listen Later Sep 12, 2022 0:54

In-situ Observation Of Alfv'en Waves In Icme Shock-Sheath Indicates Existence Of Alfv'enic Turbulence by Anil Raghav et al. on Monday 12 September The dynamic evolution of coronal mass ejection (CME) in interplanetary space generates highly turbulent, compressed, and heated shock-sheath. This region furnishes a unique environment to study the turbulent fluctuations at the small scales and serve an opportunity for unfolding the physical mechanisms by which the turbulence is dissipated and plasma is heated. How does the turbulence in the magnetized plasma control the energy transport process in space and astrophysical plasmas is an attractive and challenging open problem of the 21st century. For this, the literature discusses three types of magnetohydrodynamics (MHD) waves/ fluctuations in magnetized plasma as the magnetosonic (fast), Alfv'enic (intermediate), and sonic (slow). The magnetosonic type is most common in the interplanetary medium. However, Alfv'enic waves/fluctuations have not been identified to date in the ICME sheath. The steepening of the Alfv'en wave can form a rotational discontinuity that leads to an Alfv'enic shock. But, the questions were raised on their existence based on the theoretical ground. Here, we demonstrate the observable in-situ evidence of Alfv'en waves inside turbulent shock-sheath at 1 AU using three different methods desciribed in the literature. We also estimate Els"asser variables, normalized cross helicity, normalized residual energy and which indicate outward flow of Alfv'en waves. Power spectrum analysis of IMF indicates the existence of Alfv'enic turbulence in ICME shock-sheath. The study has strong implications in the domain of interplanetary space plasma, its interaction with planetary plasma, and astrophysical plasma. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2209.05037v1

power waves shock existence observation imf situ turbulence els cme mhd sheath arxiv alfv

Acceleration of polytropic solar wind: Parker Solar Probe observation and one-dimensional model

model sun observation acceleration dimensional 1d parker solar probe arxiv solar wind alfv

Play Episode Listen Later Sep 12, 2022 0:55

Acceleration of polytropic solar wind: Parker Solar Probe observation and one-dimensional model by Chen Shi et al. on Monday 12 September The acceleration of the solar coronal plasma to supersonic speeds is one of the most fundamental yet unresolved problem in heliophysics. Despite the success of Parker's pioneering theory on an isothermal solar corona, the realistic solar wind is observed to be non-isothermal, and the decay of its temperature with radial distance usually can be fitted to a polytropic model. In this work, we use Parker Solar Probe data from the first nine encounters to estimate the polytropic index of solar wind protons. We show that the polytropic index varies between 1.25 and $5/3$ and depends strongly on solar wind speed, faster solar wind on average displaying a smaller polytropic index. We comprehensively analyze the 1D spherically symmetric solar wind model with polytropic index $gamma in [1,5/3]$. We derive a closed algebraic equation set for transonic stellar flows, i.e. flows that pass the sound point smoothly. We show that an accelerating wind solution only exists in the parameter space bounded by $C_0/C_g < 1$ and $(C_0/C_g)^2 > 2(gamma-1)$ where $C_0$ and $C_g$ are the surface sound speed and one half of the escape velocity of the star, and no stellar wind exists for $gamma > 3/2$. With realist solar coronal temperatures, the observed solar wind with $gamma gtrsim 1.25$ cannot be explained by the simple polytropic model. We show that mechanisms such as strong heating in the lower corona that leads to a thick isothermal layer around the Sun and large-amplitude Alfv'en wave pressure are necessary to remove the constraint in $gamma$ and accelerate the solar wind to high speeds. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2209.03508v2

Magnetic field properties in star formation: a review of their analysis methods and interpretation

results methods interpretation properties magnetic magnetic fields kth dcf numerical arxiv hro histograms star formation alfv

Play Episode Listen Later Sep 12, 2022 0:59

Magnetic field properties in star formation: a review of their analysis methods and interpretation by Junhao Liu et al. on Monday 12 September Linearly polarized emission from dust grains and molecular spectroscopy is an effective probe of the magnetic field topology in the interstellar medium and molecular clouds. The longstanding Davis-Chandrasekhar-Fermi (DCF) method and the recently developed Histogram of Relative Orientations (HRO) analysis and the polarization-intensity gradient (KTH) method are widely used to assess the dynamic role of magnetic fields in star formation based on the plane-of-sky component of field orientations inferred from the observations. We review the advances and limitations of these methods and summarize their applications to observations. Numerical tests of the DCF method, including its various variants, indicate that its largest uncertainty may come from the assumption of energy equipartition, which should be further calibrated with simulations and observations. We suggest that the ordered and turbulent magnetic fields of particular observations are local properties of the considered region. An analysis of the polarization observations using DCF estimations suggests that magnetically trans-to-super-critical and averagely trans-to-super-Alfv'{e}nic clumps/cores form in sub-critical clouds. High-mass star-forming regions may be more gravity-dominant than their low-mass counterparts due to higher column density. The observational HRO studies clearly reveal that the preferential relative orientation between the magnetic field and density structures changes from parallel to perpendicular with increasing column densities, which, in conjunction with simulations, suggests that star formation is ongoing in trans-to-sub-Alfv'{e}nic clouds. There is a possible transition back from perpendicular to random alignment at higher column densities. Results from observational studies using the KTH method broadly agree with those of the HRO and DCF studies. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2208.06492v2

Acceleration of polytropic solar wind: Parker Solar Probe observation and one-dimensional model

model sun observation acceleration dimensional 1d parker solar probe arxiv solar wind alfv

Play Episode Listen Later Sep 8, 2022 1:01

Acceleration of polytropic solar wind: Parker Solar Probe observation and one-dimensional model by Chen Shi et al. on Thursday 08 September The acceleration of the solar coronal plasma to supersonic speeds is one of the most fundamental yet unresolved problem in heliophysics. Despite the success of Parker's pioneering theory on an isothermal solar corona, the realistic solar wind is observed to be non-isothermal, and the decay of its temperature with radial distance usually can be fitted to a polytropic model. In this work, we use Parker Solar Probe data from the first nine encounters to estimate the polytropic index of solar wind protons. We show that the polytropic index varies between 1.25 and $5/3$ and depends strongly on solar wind speed, faster solar wind on average displaying a smaller polytropic index. We comprehensively analyze the 1D spherically symmetric solar wind model with polytropic index $gamma in [1,5/3]$. We derive a closed algebraic equation set for transonic stellar flows, i.e. flows that pass the sound point smoothly. We show that an accelerating wind solution only exists in the parameter space bounded by $C_0/C_g < 1$ and $(C_0/C_g)^2 > 2(gamma-1)$ where $C_0$ and $C_g$ are the surface sound speed and one half of the escape velocity of the star, and no stellar wind exists for $gamma > 3/2$. With realist solar coronal temperatures, the observed solar wind with $gamma gtrsim 1.25$ cannot be explained by the simple polytropic model. We show that mechanisms such as strong heating in the lower corona that leads to a thick isothermal layer around the Sun and large-amplitude Alfv'en wave pressure are necessary to remove the constraint in $gamma$ and accelerate the solar wind to high speeds. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2209.03508v1

Magnetic field spectral evolution in the inner heliosphere

evolution sun magnetic spectral magnetic fields arxiv heliosphere alfv

Play Episode Listen Later Sep 6, 2022 0:45

Magnetic field spectral evolution in the inner heliosphere by Nikos Sioulas et al. on Tuesday 06 September The radial evolution of the magnetic field fluctuations spectral index and its dependence on plasma parameters is investigated using a merged Parker Solar Probe ($PSP$) and Solar Orbiter ($SO$) dataset covering heliocentric distances between $0.06 ~ lesssim R ~lesssim 1$ au. The spectrum is studied as a function of scale, normalized to the radially dependent ion inertial scale $d_{i}$. In the vicinity of the Sun, the magnetic spectrum inertial range is limited with a power law exponent $alpha_{B}$ consistent with the Iroshnikov-Kraichman phenomenology of Alfv'enic turbulence, $alpha_{B} = -3/2$, independent of plasma parameters. The inertial range of turbulence grows with distance from the Sun, progressively extending to larger spatial scales, while at the same time steepening towards a Kolomogorov scaling, with a mean value of $alpha_{B} =-5/3$. Highly alfv'enic intervals seem to retain their near-Sun scaling and only show a minor steepening with distance. In contrast, intervals, where turbulence is characterized by large magnetic energy excess and no dominance of outwardly propagating Alfv'enic fluctuations, appear to have spectra that steepen significantly with distance from the Sun, resulting in slightly anomalously steep inertial range slopes at $1~au$. Though generically slower solar wind streams exhibit steeper spectra, the correlation can be attributed to the underlying positive correlation between solar wind speed and alfv'enicity, i.e. to the relatively rare occurrence of highly Alfv'enic slow wind. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2209.02451v1

SISTINE to Image UV Atmospheres of Exoplanets and Stars - Ep 32

Frontier Space

Play Episode Listen Later Aug 31, 2022 42:08

Learn about SISTINE missions with 5 min suborbital flight in Summer 2022 with Far UV imaging spectroscopy imaging 100k photons at 100 to 160 nm for emission lines associated with atmospheres of low mass stars and exoplanets. With advanced optical mechanical designs, this enables SISTINE to achieve high signal-to-noise observations of emission lines from planet-hosting dwarf stars with moderate spectral resolution (R ~ 10,000) and sub-arcsecond angular imaging. Topics include: exoplanet atmospheres, borosilicate microchannel plate detectors, al coating mirror, 1200lb mass, Alfvén waves , alpha centauri, UV Flux, atomic oxygen, and significance for discovering habitable exoplanets Speaker: Kevin France PhD, Assistant Professor, Department of Astrophysical and. Planetary Sciences & LASP – University of Colorado. The large-scale magnetic field of Proxima Centauri near activity maximum https://arxiv.org/abs/2010.14311?context=astro-ph --- This episode is sponsored by · Anchor: The easiest way to make a podcast. https://anchor.fm/app Support this podcast: https://anchor.fm/frontierspace/support

colorado stars assistant professor exoplanets atmospheres planetary science proxima centauri sistine astrophysical alfv

Hugo Alfvén – kärleken och sveken

Play Episode Listen Later Jul 1, 2022 54:55

Hugo Alfvéns bekräftelsebehov fick katastrofala följder för kvinnorna i hans liv. Men relationerna var också en avgörande drivkraft i hans konstnärskap och har lämnat direkta avtryck i musiken. En P2 dokumentär. Att kärleken spelade en central roll i Hugo Alfvéns skapande råder inga tvivel om. Han närmade sig varje kvinna som hon vore den enda, men klarade inte av att hålla sig borta från otrohet och svek. Den enda kvinnan han förblev trogen genom livet var mamma Lotten, som också var den som förde in musiken i Hugo Alfvéns liv.I intervjuer från radions arkiv hörs Alfvéns styvdotter Vibeke Krøyer berätta om mannen som krossade hennes mors, Marie Krøyers, hjärta.I programmet medverkar bland andra sopranen Elin Rombo, musikvetaren Tobias Lund och dirigenten Cecilia Rydinger.En P2 dokumentär från 2022 av Sofia Nyblom.Hör också den första delen, Hugo Alfvéns Midsommarvaka, om hans mest populära verk.

men kultur att lotten alfv hugo alfv sofia nyblom elin rombo

Hugo Alfvéns Midsommarvaka – internationellt spridd och älskad

Play Episode Listen Later Jun 24, 2022 59:00

Med Midsommarvaka blev Hugo Alfvén spelad långt utanför Sveriges gränser. Verket har kommit att förknippas med den svenska landsbygden, men är lika mycket en berättelse om Alfvéns dubbla relation till kärlek och fest. En P2 Dokumentär. I dag skulle både Hugo Alfvéns musik och de memoarer han lämnat efter sig kallas för autofiktion. Tonsättarens kaotiska privatliv lämnade personliga avtryck i musiken och kärleken, havet och folkmusiken vars hans viktigaste motiv.I det här programmet fördjupar vi oss i Hugo Alfvéns mest populära verk, Midsommarvaka, och tonsättarens anknytning till Dalarna. Vi åker till Alfvéngården utanför Leksand och gör en tidsresa med Alfvéns lill-piga Ninna Tölfors, i dag 88 år.Kersti Jobs Björklöf minns barndomens midsommarfiranden hos Alfvéns i Tibble by, i sällskap med spelmanslaget och hennes morbror, legendariske spelmannen Knis Karl Aronsson.Författaren Anders Carlberg kommenterar Alfvéns kontroversiella konsertframträdande i tyskockuperade Oslo 1941, och vi följer Midsommarvakans internationella spridning i film, populärmusik och genom Svenska baletten.En P2 dokumentär från 2022 av Sofia Nyblom.Hör också del två, Hugo Alfvén, kärleken och sveken, som handlar om förföraren och naturromantikern Hugo Alfvén, sångerna och den fjärde symfonin.

kultur oslo sveriges svenska dalarna leksand internationellt verket tibble alfv hugo alfv anders carlberg sofia nyblom en p2 dokument

Hugo Alfvén, kärleken och sveken

Play Episode Listen Later May 7, 2022 56:48

Hugo Alfvéns bekräftelsebehov fick katastrofala följder för kvinnorna i hans liv. Men relationerna var också en avgörande drivkraft i hans konstnärskap och har lämnat direkta avtryck i musiken. Lyssna på alla avsnitt i Sveriges Radio Play. Att kärleken spelade en central roll i Hugo Alfvéns skapande råder inga tvivel om. Han närmade sig varje kvinna som hon vore den enda, men klarade inte av att hålla sig borta från otrohet och svek. Den enda kvinnan han förblev trogen genom livet var mamma Lotten, som också var den som förde in musiken i Hugo Alfvéns liv. I intervjuer från radions arkiv hörs Alfvéns styvdotter Vibeke Krøyer berätta om mannen som krossade hennes mors, Marie Krøyers, hjärta. I programmet medverkar bland andra sopranen Elin Rombo, musikvetaren Tobias Lund och dirigenten Cecilia Rydinger.En dokumentär från 2022 av Sofia Nyblom.Hör också den första delen, “Hugo Alfvéns Midsommarvaka“, om hans mest populära verk.

men att lyssna sveriges radio play lotten alfv dokumentr hugo alfv sofia nyblom elin rombo

Hugo Alfvén, kärleken och sveken

Play Episode Listen Later May 6, 2022 56:57

Hugo Alfvéns bekräftelsebehov fick katastrofala följder för kvinnorna i hans liv. Men relationerna var också en avgörande drivkraft i hans konstnärskap och har lämnat direkta avtryck i musiken. Att kärleken spelade en central roll i Hugo Alfvéns skapande råder inga tvivel om. Han närmade sig varje kvinna som hon vore den enda, men klarade inte av att hålla sig borta från otrohet och svek. Den enda kvinnan han förblev trogen genom livet var mamma Lotten, som också var den som förde in musiken i Hugo Alfvéns liv. I intervjuer från radions arkiv hörs Alfvéns styvdotter Vibeke Krøyer berätta om mannen som krossade hennes mors, Marie Krøyers, hjärta. I programmet medverkar bland andra sopranen Elin Rombo, musikvetaren Tobias Lund och dirigenten Cecilia Rydinger.En dokumentär från 2022 av Sofia Nyblom.Hör också den första delen, Hugo Alfvéns Midsommarvaka, om hans mest populära verk.

men att lotten alfv hugo alfv sofia nyblom elin rombo

Hugo Alfvéns Midsommarvaka – internationellt spridd och älskad

Play Episode Listen Later Apr 30, 2022 56:48

Med Midsommarvaka blev Hugo Alfvén spelad långt utanför Sveriges gränser. Verket har kommit att förknippas med den svenska landsbygden, men är lika mycket en berättelse om Alfvéns dubbla relation till kärlek och fest. Lyssna på alla avsnitt i Sveriges Radio Play. I dag skulle både Hugo Alfvéns musik och de memoarer han lämnat efter sig kallas för autofiktion. Tonsättarens kaotiska privatliv lämnade personliga avtryck i musiken – och kärleken, havet och folkmusiken vars hans viktigaste motiv.I det här programmet fördjupar vi oss i Hugo Alfvéns mest populära verk, Midsommarvaka, och tonsättarens anknytning till Dalarna. Vi åker till Alfvéngården utanför Leksand och gör en tidsresa med Alfvéns “lill-piga” Ninna Tölfors, i dag 88 år.Kersti Jobs Björklöf minns barndomens midsommarfiranden hos Alfvéns i Tibble by, i sällskap med spelmanslaget och hennes morbror, legendariske spelmannen Knis Karl Aronsson.Författaren Anders Carlberg kommenterar Alfvéns kontroversiella konsertframträdande i tyskockuperade Oslo 1941, och vi följer Midsommarvakans internationella spridning i film, populärmusik och genom Svenska baletten.En dokumentär från 2022 av Sofia Nyblom.Hör också del två, “Hugo Alfvén, kärleken och sveken”, som handlar om förföraren och naturromantikern Hugo Alfvén, sångerna och den fjärde symfonin.

oslo sveriges lyssna svenska dalarna sveriges radio play leksand internationellt verket tibble alfv hugo alfv dokumentr anders carlberg sofia nyblom

Hugo Alfvéns Midsommarvaka – internationellt spridd och älskad

Play Episode Listen Later Apr 29, 2022 56:56

Med Midsommarvaka blev Hugo Alfvén spelad långt utanför Sveriges gränser. Verket har kommit att förknippas med den svenska landsbygden, men är lika mycket en berättelse om Alfvéns dubbla relation till kärlek och fest. I dag skulle både Hugo Alfvéns musik och de memoarer han lämnat efter sig kallas för autofiktion. Tonsättarens kaotiska privatliv lämnade personliga avtryck i musiken och kärleken, havet och folkmusiken vars hans viktigaste motiv.I det här programmet fördjupar vi oss i Hugo Alfvéns mest populära verk, Midsommarvaka, och tonsättarens anknytning till Dalarna. Vi åker till Alfvéngården utanför Leksand och gör en tidsresa med Alfvéns lill-piga Ninna Tölfors, i dag 88 år.Kersti Jobs Björklöf minns barndomens midsommarfiranden hos Alfvéns i Tibble by, i sällskap med spelmanslaget och hennes morbror, legendariske spelmannen Knis Karl Aronsson.Författaren Anders Carlberg kommenterar Alfvéns kontroversiella konsertframträdande i tyskockuperade Oslo 1941, och vi följer Midsommarvakans internationella spridning i film, populärmusik och genom Svenska baletten.En dokumentär från 2022 av Sofia Nyblom.Hör också del två, Hugo Alfvén, kärleken och sveken, som handlar om förföraren och naturromantikern Hugo Alfvén, sångerna och den fjärde symfonin. Sänds lördag 7 maj.

oslo sveriges svenska dalarna leksand internationellt verket tibble alfv hugo alfv anders carlberg sofia nyblom

Jonas Åkerlund gör TV-serie av Clark Olofssons liv

original joakim soundwave alfv

Play Episode Listen Later Apr 29, 2022 53:49

Sveriges mest berömda brottsling ska bli TV-serie. Bill Skarsgård gör huvudrollen i "Clark", som har premiär på Netflix 5 maj. Björn Jansson har mött regissören, och undrar om det är en pilsnerfilm... BLAND HARAR OCH FUSKPÄLS PÅ MARKET ART FAIR38 utvalda gallerier från 7 olika länder visar upp sig på Liljevalchs i Stockholm under helgen. 70 konstnärer är representerade. Vår reporter Amanda Niklasson tar rygg på konstkritikern Clemens Poellinger och tar tempen på konstmarknaden. HUGO ALFVÉN TONMÅLARENPå söndag den 1 maj är det 150 år sedan en av Sveriges mest omtyckta tonsättare, Hugo Alfvén, föddes. Nåt som inte är lika känt är att Hugo Alfvén också var målare. Såhär skrev han om saken: "Hur mycket ligger det inte i ordet tonmålning, som i sig innesluter båda konstarterna? Men var gränsen går mellan dem, det har jag aldrig kunnat finna." Men hur ser man i måleriet att Alfvén är musiker? Och hur hör man i musiken att här bor en målare? Hör Karin Sidén, museichef på Valdemarsudde i Stockholm, och Tobias Lund, författare till Alfvénbiografin Speltoken. GABRIEL GARCIA MÁRQUEZ KRYPER INNANFÖR HUDEN PÅ DIKTATORNRomanen Patriarkens höst räknas som ett mästerverk, den bästa av de sk diktatorsromanerna som blev en egen genre under 1970-talet. Katarina Wikars samtalar med Bengt Packalén om vad det är Marquez gör så bra.Programledare: Lisa BergströmProducent: Ulph Nyström

tv netflix men bj stockholm kultur sveriges marquez tv serie jansson bill skarsg liljevalchs alfv katarina wikars hugo alfv

Joakim Alfvén

SOUNDWAVE

Play Episode Listen Later Mar 20, 2022 38:26

Today's guest deejay is Joakim Alfvén. I met Joakim through Sofia Nystrand, AKA Vargkvint. After showcasing her lovely mix during the summer (you can listen to her mix here) I asked Sofia who she thought would want to share a mix on Soundwave. I've found this a great way to be introduced to new music. Sofia went above and beyond and put me in touch with Jakob Lindhagen, Bonander, and Joakim. We'll hear from Jakob and Bonander in the next few months, but today we begin with Sofia's recommendations with Joakim's mix. I've been steeping in Joakim's mix the last few months, as I do with all the mixes sent my way. I often listen to the mixes while doing chores and errands such as walking my dog, doing dishes, folding laundry, etc. Joakim's mix, however, has been my constant companion during the mornings. While I'm drinking my first cup of coffee and sorting through emails, and scheduling my tasks for the day, Joakim's six plays in the background, the sun on my face. I'm on a riding a train with the landscape passing by my window in my imagination. Sometimes I can almost feel the train gently rocking to and fro. It's a magical experience. Please share where Joakim's mix takes you if you're so inclined. Join us next week when our guest deejay will be Munknörr. See you then. Hoshiko Yamane “Pour donner la vie” Sergio Diaz De Rojas “Pomegranate (Vargkvint Rework)” Jakob Lindhagen & Dag Rosenqvist “Gamla drömmars stad” Daniela Dahl “Genova (Reinterpretation of Original version by Joakim Alfvén)” Mathilda Skonare Karlsson “Cornélis” Night Gestalt & Klangriket “Like A Particle Of Dust” Jon Hopkins, Eleanor Turner and Voces8 “Scene Suspended (Arr. Lawson)” Apparat “Big Romance” Bonander “Backseat” --- Send in a voice message: https://anchor.fm/soundwavemix/message

Parker Solar Probe, Canon's New Low-Light Sensor, 8K VR Headset w/ Ralph Bond

Computer America

Play Episode Listen Later Jan 28, 2022 27:53

January 28, 2022 Show NotesStory 1: NASA's Parker Solar Probe is the first spacecraft to visit the sun's atmosphereSource: ScienceNews.org Story by Lisa GrossmanLink: https://bit.ly/3E4iWF1NASA held a press briefing in December highlighting data from its Parker Solar Probe that earlier this year became the first craft to enter the sun's atmosphere.The Parker Solar Probe left interplanetary space and entered the sun's atmosphere this past April where it took measurements of exactly where this atmospheric boundary lies, which is called the Alfvén critical surface.And this entry point to the sun's atmosphere is about 8 million miles above the sun's surface.Exploring this boundary was one of the Parker Solar Probe's main goals when it launched in 2018.This outer edge of the sun's atmosphere is important because it marks where packets of plasma can separate from the sun and become part of the solar wind, which is the speedy stream of charged particles that constantly emanates from the sun.Since the solar wind can potentially damage Earth's satellites and negatively impact life on our planet, scientists want to pinpoint exactly how the wind gets started to better understand how it can impact Earth.Story 2: Canon's New Sensor Could Revolutionize Low-Light PhotographySource: Gizmodo.com Story by Andrew LiszewskiLink: https://gizmodo.com/canons-new-sensor-captures-full-color-images-in-near-to-1848179414According to Nikkei Asia [an online news magazine], Canon is poised to shake up the digital imaging industry next year with a new sensor capable of capturingfull-color images at “one-tenth the brightness conventional sensors need.”This could revolutionize autonomous driving and even security systems.The most common solution to low-light photography is to rely on night vision technology which captures infrared light instead of the light that falls in the visible spectrum.It results in high-contrast imagery where it's easy to discern objects and finer details.But there's no color information, and that's what Canon is trying to remedy with its new sensors.Traditional sensors produce images based on the number of photons each pixel detects over a period of time—the more light and photons available, the better the results will be.Canon's new sensor uses an electronic element in every pixel that can multiply and generate an electrical pulse when just a single photon hits it, giving it much greater sensitivity in near total darkness.Story 3: Sony reveals 8K VR headset prototypeSource: Eurogamer.net Story by Ed NightingaleLink: https://www.eurogamer.net/articles/2021-12-08-sony-reveals-prototype-for-8k-vr-headsetSee video here: https://www.youtube.com/watch?v=QkJJA0PCOxISony revealed a prototype for an 8K Virtual Reality headset as part of its ‘Sony Technology Day' online demonstration event staged last month.8K refers to an ultra-high-definition display with a width of approximately 8,000 pixels. That's double the resolution of the 4K TVs you see in stores today.The prototype Sony VR headset uses an organic light-emitting diode micro display for each eye.Each individual eye micro display produces 4K visuals, and combined the result is an 8K extremely realistic visual experience.The use of small micro displays also helps make the VR headset smaller, lighter, and more comfortable.During the event Sony outlined how the upcoming VR headset could be used formore than gaming. For example, for medical training, design engineering and live streaming entertainment experiences.However, no pricing and availability dates were revealed.Story 4: Designers hope hydrogen-powered plane will fly halfway around the world without refuelingSource: TechCrunch.com Story by Kris HoltLink: https://techcrunch.com/2021/12/06/designers-hope-hydrogen-powered-plane-will-fly-halfway-around-the-world-without-refueling/Researchers around the world continue to look at the potential viability of hydrogen-powered commercial airliners – and here's why: Commercial electric planes won't be feasible until batteries become more powerful and lightweight.Hydrogen-powered flight is another possible way forward, and a research group, the FlyZero project, which is led by the Aerospace Technology Institute and funded by the UK government, recently disclosed a concept for a liquid hydrogen-powered midsize aircraft.It said the plane would be able to fly 279 passengers non-stop from London to San Francisco, or from London to Auckland, New Zealand with one stop for refueling.The aircraft, which has a 54-meter wingspan [177 feet] with two turbofan engines, would offer the “same speed and comfort as today's aircraft” but with zero carbon emissions.Remember – the exhaust from a hydrogen-powered vehicle is heat and water vapor.We're years away from commercial hydrogen aircraft becoming a reality, though. The refueling infrastructure doesn't exist yet and hydrogen is more expensive and difficult to store onboard than kerosene-based fuel.However, the Aerospace Technology Institute expects that, by the middle of the 2030s, efficient hydrogen planes might be a more economical option than current planes.For more info, interviews, reviews, news, radio, podcasts, video, and more, check out ComputerAmerica.com!

Episode 381: Disposable in the Nicest Way Possible

Science Faction Podcast

Play Episode Listen Later Jan 2, 2022 67:28

This episode contains: No Steven this week, but Devon and Ben make do. Devon got his son a Lego Hogwarts castle. Ben thought we'd be without Lego talk with Steven not on the show. He was wrong. Devon practiced an hour to pitch in a VR baseball game, and still sucks. Oooh girl, shock me like an eletric eel: Here's how to give an electric eel an MRI. Ben talks about how to give an electric eel an MRI. Devon asks "Why?" but still thinks eel skeletons are pretty metal. An anesthesized eel can still drown... How do vets keep them breathing? Ever wanted to know how to reconstruct a blown knee on a bullfrog? https://arstechnica.com/science/2021/12/how-to-give-an-electric-eel-an-mri/ Here comes the sun!: A spacecraft has 'touched' the sun for the first time. NASA's Parker Solar Probe spent five hours in the sun's corona. WOW! Devon talks about Alfvén critical waves, theorized in 1942 and proven in 2019. Turns out the corona is far hotter than the surface of the sun. NASA's Parker Solar Probe is the fastest known object built by humans. https://www.sciencedaily.com/releases/2021/12/211214134947.htm Science Fiction: Doom Patrol season 3 was crazy! Devon and Ben really liked it. Devon is caught up on season 4 of Star Trek: Discovery, but skipped season 3. We talk future airdates for Star Trek: Discovery, Prodigy and Picard in early 2022. Ben and Devon wrap it up with a low-spoiler chat about The Matrix Resurrections.

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American Chestnut, ‘Don't Look Up' Movie, Aurora Electrons. December 24, 2021, Part 1

Science Friday

Play Episode Listen Later Dec 24, 2021 47:52 Very Popular

The Resurrection Of The American Chestnut At the turn of the 20th century, the American chestnut towered over other trees in forests along the eastern seaboard. These giants could grow up to 100 feet high and 13 feet wide. According to legend, a squirrel could scamper from New England to Georgia on the canopies of American chestnuts, never touching the ground. Then the trees began to disappear, succumbing to a mysterious fungus. The fungus first appeared in New York City in 1904—and it spread quickly. By the 1950s, the fungus had wiped out billions of trees, effectively driving the American chestnut into extinction. Now, some people are trying to resurrect the American chestnut—and soon. But not everyone thinks that's a good idea. Reporter Shahla Farzan and “Science Diction” host and producer Johanna Mayer bring us the story of the death and life of the American chestnut. 'Don't Look Up' Asks If Satire Can Stir Us From Climate Apathy What if scientists warned of a certain upcoming doomsday and no one took them seriously? That's the plot of director Adam McKay's latest dark comedy, Don't Look Up. Two astronomers discover a comet that's heading towards the Earth. The catch: There's only six months and 14 days to avert a total annihilation of humanity. The scientists, played by Leonardo DiCaprio and Jennifer Lawrence, embark on a media campaign to convince the world and the president, played by Meryl Streep, to take the threat seriously. Joining Ira to talk about the parallels between this movie and real world crises like climate change and COVID-19 are Sonia Epstein, executive editor and associate curator of science and film at the Museum of the Moving Image in New York City, and Samantha Montano, assistant professor of emergency management at the Massachusetts Maritime Academy, based in Buzzards Bay, Massachusetts. Montano is also the author of Disasterology: Dispatches from the Frontline of the Climate Crisis. Surfing Particles Can Supercharge Northern Lights For thousands of years, humans have been observing and studying the Northern lights, aurora borealis, and their southern hemisphere counterpart, aurora australis. The simplest explanation for how these aurora form has been unchanged for decades: Charged particles, energized by the sun, bounce off the Earth's protective magnetic field and create flashes of light in the process. But for a long time, scientists have known it was more complicated than that. What exactly gives those incoming particles the energy they need to create the patterns we see? And why are some aurora more dramatic and distinct, while others are subtle and hazier? Aurora researcher Jim Schroeder explains new work published in Nature Communications that suggests that in more vivid aurora, electrons may “surf” waves of energy from space into our atmosphere. The waves, called Alfvén waves, are a side effect of the solar wind warping the Earth's magnetic field. Schroeder explains the weird physics of our aurora, and what we could learn about other objects in the universe as a result.

Es más fácil llegar al Sol que a tu corazón

PARSEC

Play Episode Listen Later Dec 21, 2021 36:54

Un cable defectuoso retrasa dos días el lanzamiento del James Webb. La sonda Parker ha "tocado" el Sol. La NASA selecciona tres estaciones espaciales comerciales. Roscosmos elige a la primera cosmonauta que volará con SpaceX. ¿Último retraso en el lanzamiento del telescopio espacial James Webb? Esta vez un cable defectuoso con el que se transmiten datos para realizar una prueba de salud del telescopio antes del lanzamiento. En el momento en que estamos publicando este podcast, el lanzamiento está previsto para el 24 de diciembre a las 12:20 UTC (13:20 de la España peninsular). Está pronosticado lluvia en el puerto espacial de Kourou, en la Guayana Francesa. La sonda Parker ha tocado el Sol. En realidad, ocurrió el 28 de abril. Primera vez que un vehículo humano ingresa en la atmósfera solar, tres años después del lanzamiento de 2018. Ha volado a través de la atmósfera superior del Sol, la corona, tomando muestras de las partículas y campos magnéticos. Hasta ahora, los investigadores no estaban seguros de dónde se encontraba exactamente la superficie crítica de Alfvén, que marca el final de la atmósfera solar y el comienzo del viento solar. Hay imágenes: "Vemos evidencia de estar en la corona en datos de campo magnético, datos de viento solar y visualmente, en imágenes. De hecho, podemos ver la nave espacial volando a través de estructuras coronales que se pueden observar durante un eclipse solar total". Se aprecian estructuras coronales similares a las serpentinas. La NASA selecciona tres ganadoras del programa CLD (Commercial LEO Destinations). Con la expectativa de que la Estación Espacial Internacional, de 23 años, no va a durar más allá de la década de 2020, la NASA está recurriendo al sector privado en busca de ayuda. Objetivo: construir una estación espacial comercial en órbita baja independiente de la Estación Espacial Internacional que esté operativa en 2029 o 2030.Ganadoras: Blue Origin, $130 milliones. Nanoracks, $160 milliones. Northrop Grumman, $125,6 milliones. Reparto bastante uniforme, a diferencia de los contratos anteriores. El dinero de estos contratos se deberá gastar entre 2022 y 2025 durante la Fase 1 hasta alcanzar un nivel de diseño preliminar, estudiando riesgos, presupuestos, cronograma, etc. * En la Fase 2, a partir de 2025, se procederá a la construcción de las estaciones con asesoramiento de la NASA. Había once candidatas, incluida SpaceX (que perdió). En cambio, no participó Axiom, que fue seleccionada por la NASA como proveedora del primer módulo comercial para la Estación Espacial Internacional. Axiom planea operar a partir de ese primer módulo su propia estación espacial, la Axiom Station, cuando retiren la ISS. SpaceX realiza tres lanzamientos en tres días, con sus tres barcazas autónomas desplegadas al mismo tiempo por primera vez. El propulsor B1051 ha roto el récord de aterrizajes: 11. El objetivo del Falcon 9 Block 5 era un mínimo de 10 vuelos con una revisión mínima y de hasta 100 con una restauración completa. Por cierto, las cosas empiezan a moverse de nuevo en Starbase, al sureste de Texas. Roscosmos selecciona a la primera cosmonauta para volar con SpaceX. Anna Kikina volaría en otoño de 2022. Un astronauta volaría en la Soyuz casi al mismo tiempo, aunque el acuerdo no está cerrado. Este intercambio de asientos permite que haya siempre alguien de la otra agencia espacial en órbita si una nave falla. La NASA selecciona nuevos candidatos a astronautas. Diez elegidos de 12.000 solicitantes. La ESA continúa con su proceso de selección. Entre los candidatos escogidos se encuentran Jorge Pla-García, investigador y científico del Centro de Astrobiología que ha participado en misiones de la NASA y de la ESA. Y Laura Parro, geóloga planetaria y divulgadora científica del Instituto Universitario de Física Aplicada de la Universidad de Alicante. https://www.space.com/jwst-launch-delay-due-to-faulty-data-cable https://ciencia.nasa.gov/la-nasa-ingresa-la-atmosfera-solar-por-primera-vez-aportando-nuevos-descubrimientos https://www.youtube.com/watch?v=1y2Asd5_ito https://www.nasa.gov/press-release/nasa-selects-companies-to-develop-commercial-destinations-in-space https://danielmarin.naukas.com/2021/12/11/las-estaciones-espaciales-comerciales-del-programa-cld-de-la-nasa/ https://www.ondacero.es/programas/la-rosa-de-los-vientos/audios-podcast/entrevistas/laura-parro-jorgepla-garcia-candidatos-astronautas-llevan-limite_20211122619b6e7e9e04bd00018a2aa0.html https://twitter.com/JaSantaolalla/status/1468371382895624196 PARSEC es un podcast semanal sobre exploración espacial presentado por Javier Atapuerca y Matías S. Zavia. Haznos llegar tus preguntas por Twitter: @parsecpodcast@JaviAtapu@matiass Puedes escucharnos en todas las plataformas a través de parsecpodcast.com.

Earworms Aid Memory, How Auroras Happen, Don't Give Cats Milk

Curiosity Daily

Play Episode Listen Later Aug 9, 2021 13:54

Learn how earworms could be helping your memory; how auroras are created; and what your cat should drink instead of milk. Maybe that song stuck in your head is helping your long-term memory by Cameron Duke Karen Michele Nikos-Rose. (2021, June 15). That Song Is Stuck in Your Head, but It's Helping You to Remember. UC Davis. https://www.ucdavis.edu/news/song-stuck-in-head-helps-remember Kubit, B. M., & Janata, P. (2021). Spontaneous mental replay of music improves memory for incidentally associated event knowledge. Journal of Experimental Psychology: General. https://doi.org/10.1037/xge0001050 We have the first experimental evidence for how auroras are created by Briana Brownell Physicists report definitive evidence how auroras are created. (2021). EurekAlert! https://www.eurekalert.org/pub_releases/2021-06/uoi-prd060321.php ‌Auroral Electron Acceleration. (2021). Uiowa.edu. https://homepage.physics.uiowa.edu/~ghowes/research/aurora.html Schroeder, J. W. R., Howes, G. G., Kletzing, C. A., Skiff, F., Carter, T. A., Vincena, S., & Dorfman, S. (2021). Laboratory measurements of the physics of auroral electron acceleration by Alfvén waves. Nature communications, 12(1), 1-9. https://www.nature.com/articles/s41467-021-23377-5.epdf A Feline Myth Debunked: Don't Give Your Cat Milk by Anna Todd Fries, W. C. (2009, July 17). Cats and Dairy: Get the Facts. WebMD; WebMD. https://pets.webmd.com/cats/guide/cats-and-dairy-get-the-facts#1 Bradshaw, J. (2019, May 20). Why can't cats drink milk? Plus 6 other feline myths. BBC Science Focus Magazine; BBC Science Focus Magazine. https://www.sciencefocus.com/nature/why-cant-cats-drink-milk-plus-6-other-feline-myths/ Causes and diagnosis of lactose intolerance. (2018, November 29). Nih.gov; Institute for Quality and Efficiency in Health Care (IQWiG). https://www.ncbi.nlm.nih.gov/books/NBK310263/ Follow Curiosity Daily on your favorite podcast app to learn something new every day withCody Gough andAshley Hamer. Still curious? Get exclusive science shows, nature documentaries, and more real-life entertainment on discovery+! Go to https://discoveryplus.com/curiosity to start your 7-day free trial. discovery+ is currently only available for US subscribers. See omnystudio.com/listener for privacy information.

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Answers News: Did Archeologists Find Terah?

Answers TV Daily

Play Episode Listen Later Jun 30, 2021 34:56

Woman warns neighbors with purrfect sign; Geologists claim dating methods reveal a non-random pattern for catastrophes; Sesame Street puppets promote pride; Archeologists think Terru of Urkesh may be Abraham's father Terah of Ur; Australian Senate opposes Critical Race Theory (CRT) and calls it Marxist indoctrination; Cornell University course explores connection between astronomy and racial blackness; Physicists publish Alfvén wave theory after 20-year-study of auroras; Researchers estimate rate at which extinct dwarf elephant got smaller . . . and other stories reviewed during this June 30, 2021, broadcast of Answers News. - - - - - - - - - - - Terah took Abram his son and Lot the son of Haran, his grandson, and Sarai his daughter-in-law, his son Abram's wife, and they went forth together from Ur of the Chaldeans to go into the land of Canaan, but when they came to Haran, they settled there. The days of Terah were 205 years, and Terah died in Haran. - - - - - - - - - - - Genesis 11:31-32 Articles: Woman creates purrfect sign to warn neighbors of thieving cat https://www.huffpost.com/entry/cat-thief-sign_n_60c4e876e4b0583aec450f6d The Earth Suffers a Regular Cycle of Horrific Catastrophes, Scientists Say https://futurism.com/the-byte/earth-catastrophe-heartbeat Sesame Street introduces family with two gay dads marking Pride Month, Fathers Day https://thehill.com/blogs/blog-briefing-room/news/559477-sesame-street-introduces-family-with-two-gay-dads-marking-pride Has Abraham's Father, Terah, Been discovered? https://watchjerusalem.co.il/1233-has-abrahams-father-terah-been-discovered Australia Senate moves to block critical race theory from national curriculum: ‘Education, not indoctrination.' https://www.breitbart.com/politics/2021/06/23/australia-senate-moves-to-block-critical-race-theory-from-national-curriculum-education-not-indoctrination/ Black holes are connected to ‘Racial Blackness' Cornell U course says https://www.dailywire.com/news/black-holes-are-connected-to-racial-blackness-cornell-u-course-says We finally know what sparks the Northern Lights https://www.popsci.com/science/how-auroras-form-mystery/ Extinct Sicilian elephant lost 8000 kilograms as it evolved and shrank https://www.newscientist.com/article/2281644-extinct-sicilian-elephant-lost-8000-kilograms-as-it-evolved-and-shrank/ The IRS refuses tax exempt status to religious organization because “Bible teachings” are “Republican” https://firstliberty.org/cases/christians-engaged/ - - - - - - - - - - - image credit: gorodenkoff iStock / Getty Image # 1312318063 --- Send in a voice message: https://anchor.fm/answerstv/message Support this podcast: https://anchor.fm/answerstv/support

Tennisappen tar in tunga investerare och servar mot Europa

Digitalpodden

Play Episode Listen Later Jun 16, 2021 22:11

Mjukvarubolaget Matchi växte fram ut grundarens frustration kring att boka tennisbana. Nu genomförs 860 000 bokningar på plattformen varje månad. I veckans avsnitt tar vi även upp e-sportbolaget G-Loots uppskjutna börsplaner och tar en titt på edtech-bolaget Kognity som plockade in 165 miljoner kronor i veckan från riskkapitalbolaget Alfvén och Didrikson. Varför räcker inte vanliga fysiska läromedel för dagens ungdom? vi reder ut allt i veckans avsnitt av Digitalpodden. See acast.com/privacy for privacy and opt-out information.

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¿Cómo se forman las auroras?

Narices de Tycho

Play Episode Listen Later Jun 13, 2021 8:50

Aunque a latitudes tropicales es difícil verlas, el espectáculo de las auroras ha fascinado a la humanidad desde siempre. La historia de ellas la podemos comenzar a 150 millones de kilómetros, en la superficie del Sol, con el plasma arrojado por nuestra estrella. Este material llega a nuestro planeta e interactúa con el campo magnético y entonces... ...En esta ocasión les hablo sobre cómo, grosso modo, se forman las auroras. Aunque desconocemos muchos detalles al respecto, poco a poco las vamos entendiendo. Estos fenómenos son parte básica del estudio del "clima espacial" y tienen una implicación más cercana a nuestra vida cotidiana de lo que podríamos pensar. Referencias: Este episodio está basado en la nota del blog: ¿Cómo se forman las auroras? La investigación sobre las ondas de Alfvén fue publicada en la Nature Communications bajo el título "Laboratory measurements of the physics of auroral electron acceleration by Alfvén waves" por Schroeder et al. (https://rdcu.be/cl5lF) Música de fondo: "Darklight", John Dyson (http://www.johndysonmusic.com/) Redes Sociales · Twitter... @naricesdetycho · Facebook... https://www.facebook.com/NaricesdeTycho · Instagram... https://www.instagram.com/naricesdetycho · Youtube... https://www.youtube.com/channel/UCBZi8bpN1DG8IqaDnWpNNZQ/

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Verdi gives a refund

Composers Datebook

Play Episode Listen Later May 10, 2021 2:00

Synopsis Is the customer always right? Apparently Giuseppe Verdi thought so–to a degree, at least. On today’s date in 1872, Verdi sent a note to his publisher with an attached letter he had received from a disgruntled customer, a certain Prospero Bertani, who had attended not one, but two performances of Verdi’s brand-new opera, “Aida.” Bertani said, “I admired the scenery... I listened with pleasure to the excellent singers, and took pains to let nothing escape me. After it was over, I asked myself whether I was satisfied. The answer was ‘no’.” Since everyone else seemed to think “Aida” was terrific, Bertani attended a second performance to make sure he wasn’t mistaken, and concluded: “The opera contains absolutely nothing thrilling or electrifying. If it were not for the magnificent scenery, the audience would not sit through it.” Bertini itemized his expenses for tickets, train fare, and meals, and asked Verdi for reimbursement. Verdi was so amused that he instructed Ricordi to pay Bertani – but not the full amount, since, as Verdi put it: “…to pay for his dinner too? No! He could very well have eaten at home!” COMPOSERS DATEBOOK is produced by APM, American Public Media, in collaboration with the American Composers Forum, reminding you that "all music was once new." Music Played in Today's Program Giuseppe Verdi (1813 - 1901) Aida excerpts On This Day Births 1697 - French violinist and composer Jean Marie Leclair, in Lyons; 1888 - Austrian-born American film composer Max Steiner, in Vienna; 1894 - Russian-born American film composer, Dimitri Tiomkin, in St. Petersburg; 1916 - American composer Milton Babbitt, in Philadelphia; Deaths 1760 - German composer Johann Christoph Graupner, age 77, in Darmstadt; Premieres 1876 - Wagner: "Festival March" (commissioned for the American Centennial), at the opening of the Centennial Exposition in Philadelphia, conducted by Theodore Thomas; 1894 - R. Strauss: opera "Guntram," in Weimar at the Hoftheater, with the composer conducting; 1904 - Alfvén: "Midsommarvaka" (Midsummer Vigil), in Stockholm; 1907 - Dukas: opera "Ariane et Barbe-Blue" (Ariane and Bluebeard),in Paris; 1954 - Rautavaara: "A Requiem in Our Time," in Cincinnati, with Cincinnati Brass Choir, Ernest N, Glover, conducting; This work had won First Prize in the Thor Johnson Composition Contest that year; 1957 - Shostakovich: Piano Concerto No. 2, in Moscow, by the USSR State Symphony, Nikolai Anosov conducting, with the composer's son, Maxim, as the soloist; 1964 - Roy Harris: "Epilogue to ‘Profiles in Courage'" for orchestra, in Los Angeles; 1985 - Peter Maxwell Davies: "An Orkney Wedding, with Sunrise" for orchestra with bagpipe solo, ay Boston's Symphony Hall, by the Boston Pops conducted by John Williams; 1985 - Michael Torke: "Ecstatic Orange," at the Cooper Union in New York, by the Brooklyn Philharmonic, Lukas Foss conducting; 1997 - Philip Glass: opera "The Marriage Between Zones Three, Four and Five" (based on the sci-fi novel by Doris Lessing), at the State Theater in Heidelberg (Germany); Others 1824 - American premiere of Mozart's opera "The Marriage of Figaro" (sung in English ) at the Park Theater in New York.

american new york english los angeles marriage philadelphia russian courage cincinnati moscow stockholm sunrise mozart austrian john williams requiem petersburg epilogues lyons profiles glover strauss ariane verdi refund weimar figaro darmstadt our time philip glass bluebeard apm ricordi cooper union american public media boston pops first prize doris lessing symphony hall max steiner state theater bertini bertani music played dimitri tiomkin dukas american composers forum roy harris peter maxwell davies rautavaara alfv heidelberg germany milton babbitt jean marie leclair guntram brooklyn philharmonic centennial exposition

Verdi gives a refund

Composers Datebook

Play Episode Listen Later May 10, 2021 2:00

Synopsis Is the customer always right? Apparently Giuseppe Verdi thought so–to a degree, at least. On today’s date in 1872, Verdi sent a note to his publisher with an attached letter he had received from a disgruntled customer, a certain Prospero Bertani, who had attended not one, but two performances of Verdi’s brand-new opera, “Aida.” Bertani said, “I admired the scenery... I listened with pleasure to the excellent singers, and took pains to let nothing escape me. After it was over, I asked myself whether I was satisfied. The answer was ‘no’.” Since everyone else seemed to think “Aida” was terrific, Bertani attended a second performance to make sure he wasn’t mistaken, and concluded: “The opera contains absolutely nothing thrilling or electrifying. If it were not for the magnificent scenery, the audience would not sit through it.” Bertini itemized his expenses for tickets, train fare, and meals, and asked Verdi for reimbursement. Verdi was so amused that he instructed Ricordi to pay Bertani – but not the full amount, since, as Verdi put it: “…to pay for his dinner too? No! He could very well have eaten at home!” COMPOSERS DATEBOOK is produced by APM, American Public Media, in collaboration with the American Composers Forum, reminding you that "all music was once new." Music Played in Today's Program Giuseppe Verdi (1813 - 1901) Aida excerpts On This Day Births 1697 - French violinist and composer Jean Marie Leclair, in Lyons; 1888 - Austrian-born American film composer Max Steiner, in Vienna; 1894 - Russian-born American film composer, Dimitri Tiomkin, in St. Petersburg; 1916 - American composer Milton Babbitt, in Philadelphia; Deaths 1760 - German composer Johann Christoph Graupner, age 77, in Darmstadt; Premieres 1876 - Wagner: "Festival March" (commissioned for the American Centennial), at the opening of the Centennial Exposition in Philadelphia, conducted by Theodore Thomas; 1894 - R. Strauss: opera "Guntram," in Weimar at the Hoftheater, with the composer conducting; 1904 - Alfvén: "Midsommarvaka" (Midsummer Vigil), in Stockholm; 1907 - Dukas: opera "Ariane et Barbe-Blue" (Ariane and Bluebeard),in Paris; 1954 - Rautavaara: "A Requiem in Our Time," in Cincinnati, with Cincinnati Brass Choir, Ernest N, Glover, conducting; This work had won First Prize in the Thor Johnson Composition Contest that year; 1957 - Shostakovich: Piano Concerto No. 2, in Moscow, by the USSR State Symphony, Nikolai Anosov conducting, with the composer's son, Maxim, as the soloist; 1964 - Roy Harris: "Epilogue to ‘Profiles in Courage'" for orchestra, in Los Angeles; 1985 - Peter Maxwell Davies: "An Orkney Wedding, with Sunrise" for orchestra with bagpipe solo, ay Boston's Symphony Hall, by the Boston Pops conducted by John Williams; 1985 - Michael Torke: "Ecstatic Orange," at the Cooper Union in New York, by the Brooklyn Philharmonic, Lukas Foss conducting; 1997 - Philip Glass: opera "The Marriage Between Zones Three, Four and Five" (based on the sci-fi novel by Doris Lessing), at the State Theater in Heidelberg (Germany); Others 1824 - American premiere of Mozart's opera "The Marriage of Figaro" (sung in English ) at the Park Theater in New York.

american new york english los angeles marriage philadelphia russian courage cincinnati moscow stockholm sunrise mozart austrian john williams requiem petersburg epilogues lyons profiles glover strauss ariane verdi refund weimar figaro darmstadt our time philip glass bluebeard apm ricordi cooper union american public media boston pops first prize doris lessing symphony hall max steiner state theater bertini bertani music played dimitri tiomkin dukas american composers forum roy harris peter maxwell davies rautavaara alfv heidelberg germany milton babbitt jean marie leclair guntram brooklyn philharmonic centennial exposition

Ni måste orkar ta de jobbiga ägarsamtalen (

Fail n' Grow

Play Episode Listen Later Apr 23, 2021 36:21

Högaktuella Jens har med sitt team och tillsammans med Alfvén & Didrikson sålt Offerta till Fortnox för 300 MSEK. För 13 år sedan grundade entreprenören Jens Nilsson Offerta för att hjälpa till i matchen mellan de lokala företagen och kunderna. Nu driver Jens Nyvik som investerar i bolag med en digital affärsmodell, ett “360-team” och en realistisk förväntansbild om hur länge ni kommer att hänga ihop. Jens delar öppet om erfarenheterna om varför just det är viktigt. Det är lärdomar som resan med Offerta gett, både det oerhört svåra och utmanande samt framgångsfaktorerna. Det inkluderar varför du inte får vara för snäll och varför ni måste ta de svåra utmanande samtalen om både det affärsmässiga och mänskliga. Lyssna in till ett härligt samtal med högaktuella, erfarna och kloka Jens Nilsson.

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Joel Alfvén - Förtrösta På Gud

Play Episode Listen Later Apr 18, 2021 26:45

Joel Alfvén - Förtrösta På Gud by Pingstkyrkan Arken, Värnamo

alfv

Joel Alfvén - Håll fokus på Guds kärlek och förlåtelse

Clásica FM Radio - Podcast de Música Clásica

Play Episode Listen Later Feb 28, 2021 25:45

Joel Alfvén - Håll fokus på Guds kärlek och förlåtelse by Pingstkyrkan Arken, Värnamo

fokus guds krlek alfv

Hoy Toca: La Polka

Play Episode Listen Later Dec 29, 2020 45:20

Carlos Iribarren | Llega el cambio de año y queremos despedirlo bailando, como hicimos hace 365 días. Si recibimos 2020 a ritmo de vals, esta vez os ofrecemos las mejores polkas, provenientes de la creatividad de compositores tan diversos como Johann Strauss hijo, Alfvén, Shostakovich, Smetana, Minkus o dos de los grandes autores de bandas sonoras, los italianos Nino Rota y Ennio Morricone. Además de escuchar buenísima música, os contaremos muchas curiosidades sobre esta danza tan popular en muchos rincones de Europa en la buenísima compañía de Mario Mora y María Fernández Dobao, historiadora, pianista y profesora en el Conservatorio Profesional de Alcalá de Henares. ¿Cuál es su origen? ¿Qué tipos de polka hay? ¿Por qué es tan habitual en los ballets clásicos? No esperes más y disfruta con nosotros de esta nueva entrega de Hoy Toca, el programa de Clásica FM que te quiere sorprender.

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Hoy Toca: La Polka

Clásica FM Radio - Podcast de Música Clásica

Play Episode Listen Later Dec 29, 2020 45:20

Carlos Iribarren | Llega el cambio de año y queremos despedirlo bailando, como hicimos hace 365 días. Si recibimos 2020 a ritmo de vals, esta vez os ofrecemos las mejores polkas, provenientes de la creatividad de compositores tan diversos como Johann Strauss hijo, Alfvén, Shostakovich, Smetana, Minkus o dos de los grandes autores de bandas sonoras, los italianos Nino Rota y Ennio Morricone. Además de escuchar buenísima música, os contaremos muchas curiosidades sobre esta danza tan popular en muchos rincones de Europa en la buenísima compañía de Mario Mora y María Fernández Dobao, historiadora, pianista y profesora en el Conservatorio Profesional de Alcalá de Henares. ¿Cuál es su origen? ¿Qué tipos de polka hay? ¿Por qué es tan habitual en los ballets clásicos? No esperes más y disfruta con nosotros de esta nueva entrega de Hoy Toca, el programa de Clásica FM que te quiere sorprender.

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Var Satie verkligen kapellmästare i Rosenkors-Orden?

Fråga musikprofessorn

Play Episode Listen Later Aug 1, 2020 58:40

Min röst saknar timbre, kan jag finna den? Och varför är där två riktigt fula insatser från blåsarna i Alfvéns Midsommarvaka? Ja, det är några av frågorna i veckans avsnitt. Lyssna på alla avsnitt i Sveriges Radio Play. Svaren får ni som vanligt av Mattias Lundberg och Maja Åström.

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Var Satie verkligen kapellmästare i Rosenkors-Orden?

Fråga musikprofessorn

Play Episode Listen Later Aug 1, 2020 58:17

Min röst saknar timbre, kan jag finna den? Och varför är där två riktigt fula insatser från blåsarna i Alfvéns Midsommarvaka? Ja, det är några av frågorna i veckans avsnitt. Lyssna på alla avsnitt i Sveriges Radio Play. Svaren får ni som vanligt av Mattias Lundberg och Maja Åström.

var lyssna orden stare maja verkligen svaren satie sveriges radio play mattias lundberg alfv kapellm

Var Satie verkligen kapellmästare i Rosenkors-Orden?

Fråga musikprofessorn

Play Episode Listen Later Aug 1, 2020 38:09

Min röst saknar timbre, kan jag finna den? Och varför är där två riktigt fula insatser från blåsarna i Alfvéns Midsommarvaka? Ja, det är några av frågorna i veckans avsnitt. Svaren får ni som vanligt av Mattias Lundberg och Maja Åström.

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Joel Alfvén - Vila för våran själ

Play Episode Listen Later Jul 12, 2020 26:14

Joel Alfvén - Vila för våran själ by Pingstkyrkan Arken, Värnamo

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Joel Alfvén - Tankar

Play Episode Listen Later May 31, 2020 17:38

Joel Alfvén - Tankar by Pingstkyrkan Arken, Värnamo

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Evelina Och Joel Alfvén - Jesus står för dig

Play Episode Listen Later May 29, 2020 21:25

Evelina Och Joel Alfvén - Jesus står för dig by Pingstkyrkan Arken, Värnamo

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Inger Alfvén – om uppriktighet, relationer och vad man egentligen kan veta om andra människor

Kulturreportaget i P1

Play Episode Listen Later Feb 18, 2020 30:35

Inger Alfvén är en av Sveriges mest folkkära författare. I fjol kom hennes 25:e roman och i dagarna fyller hon 80. P1 Kultur besökte henne hemma i lägenheten på Reimersholme i Stockholm. Inger Alfvén debuterade på 60-talet men det var 70-tals romanerna "Städpatrullen", "Dotter till en dotter" och "S/Y Glädjen" som gjort henne till något av en generationsförfattare. Frilansjournalisten Sandra Stiskalo gör ett hemma-hos-besök hos Inger Alvén, för ett samtal om uppriktighet, relationer och vad man egentligen kan veta om andra människor. Sandra Stiskalo p1kultur@sverigesradio.se

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Hemma hos författaren Inger Alfvén

Play Episode Listen Later Feb 18, 2020 53:30

Inger Alfvén är en av Sveriges mest folkkära författare. I fjol kom hennes 25:e roman och i dagarna fyller hon 80. P1 Kultur besökte henne hemma i lägenheten på Reimersholme i Stockholm för ett samtal om uppriktighet, relationer och vad man egentligen kan veta om andra människor. SHORT STORIES PÅ OPERAN NYSKRIVET I KORTFORMAT Kungliga operan har bjudit in tre samtida tonsättare Andrea Tarrodi, Malin Hülphers och Viktor Åslund för att skriva varsin kortopera. Samtal med kritiker Per Feltzin. OBS: ATT SKRIVA ESSÄER ÄR ATT VÄGRA VARA NYTTIG Den andra delen i OBS serie om essäkonsten menar Dan Jönsson att varje essä är ett misslyckande som verkar förutsätta en onyttig livsstil, en antiekonomisk, närmast antisocial letargi och tillbakadragenhet som går stick i stäv med tidens krav. Programledare: Saman Bakhtiari Producent: Eskil Krogh Larsson

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Joel & Evelina Alfvén - Vad doftar vi