Matter in strong magnetic fields - the Max Planck Institute for the
... The properties of matter are drastically modified by strong magnetic fields, BⰇm e2 e 3 c/ប 3 ⫽2.35 ⫻109 G ( 1 G⫽10⫺4 T) , as are typically found on the surfaces of neutron stars. In such strong magnetic fields, the Coulomb force on an electron acts as a small perturbation compared to the magnetic f ...
... The properties of matter are drastically modified by strong magnetic fields, BⰇm e2 e 3 c/ប 3 ⫽2.35 ⫻109 G ( 1 G⫽10⫺4 T) , as are typically found on the surfaces of neutron stars. In such strong magnetic fields, the Coulomb force on an electron acts as a small perturbation compared to the magnetic f ...
release history and transport parameters of relativistic solar
... We study four consecutive 300–800 keV electron events observed on 1980 May 28 by Helios-1, when the spacecraft was located at 0.31 AU from the Sun. We use two different techniques to extract the release time history of electrons at the Sun: (1) a data-driven method based on the assumption that parti ...
... We study four consecutive 300–800 keV electron events observed on 1980 May 28 by Helios-1, when the spacecraft was located at 0.31 AU from the Sun. We use two different techniques to extract the release time history of electrons at the Sun: (1) a data-driven method based on the assumption that parti ...
Magnetic field structure in single late
... greater that 0.1Ic , where Ic is the continuum level, and after removal of chromospheric lines and of spectral domains affected by telluring bands). By doing so, the signal-to-noise ratio (S/N) is increased to the point where weak polarized Zeeman signatures can be detected in all 38 spectra, thanks ...
... greater that 0.1Ic , where Ic is the continuum level, and after removal of chromospheric lines and of spectral domains affected by telluring bands). By doing so, the signal-to-noise ratio (S/N) is increased to the point where weak polarized Zeeman signatures can be detected in all 38 spectra, thanks ...
Hydrostatic equilibrium in a magnetized, warped Galactic disc
... which we have determined. The layer at 1 & |z| & 4 kpc can be overpressured and an outflow at a speed of about 50 km s21 may occur there, presumably associated with a Galactic fountain flow, if B0 . 2 mG. We show that hydrostatic equilibrium in a warped disc must produce asymmetric density distribut ...
... which we have determined. The layer at 1 & |z| & 4 kpc can be overpressured and an outflow at a speed of about 50 km s21 may occur there, presumably associated with a Galactic fountain flow, if B0 . 2 mG. We show that hydrostatic equilibrium in a warped disc must produce asymmetric density distribut ...
Modelling magnetic fields in spiral galaxies
... gives magnetic field vectors from a typical simulation. Unfortunately there is no good observational determination of the magnetic field for this galaxy (it is small and radio-weak), so the desired comparison with observed fields could not be made. Moss et al. (2007) attempted to model the well-obse ...
... gives magnetic field vectors from a typical simulation. Unfortunately there is no good observational determination of the magnetic field for this galaxy (it is small and radio-weak), so the desired comparison with observed fields could not be made. Moss et al. (2007) attempted to model the well-obse ...
FP11: DRAKE et al. - Astronomical Institute WWW Homepage
... radius of this star, as well as the inclination angle of the rotational axis. The ambipolar diffusion of hydrogen which affects much more strongly light ionized particles may enhance significantly the Li abundance and might also enhance the 6Li/7Li isotopic ratio (Babel & Michaud 1991; Babel 1993). ...
... radius of this star, as well as the inclination angle of the rotational axis. The ambipolar diffusion of hydrogen which affects much more strongly light ionized particles may enhance significantly the Li abundance and might also enhance the 6Li/7Li isotopic ratio (Babel & Michaud 1991; Babel 1993). ...
Growth of the inner core in the mean
... scales of the boundary layers, where helicity of the incompressible fluid is generated, are too small to generate the magnetic field. It means that extrapolation of helicity profiles to the realistic E can lead to the break of the magnetic field generation at all. However, in the compressible fluid ...
... scales of the boundary layers, where helicity of the incompressible fluid is generated, are too small to generate the magnetic field. It means that extrapolation of helicity profiles to the realistic E can lead to the break of the magnetic field generation at all. However, in the compressible fluid ...
Investigation of mass flows in the transition region and corona in a
... and bottom. At the bottom boundary, the temperatures and densities are set to the average photospheric temperature and density values at τ=1. The magnetic field at the lower boundary is driven by horizontal motions mimicking the photospheric horizontal granular motions. This leads to the braiding of ...
... and bottom. At the bottom boundary, the temperatures and densities are set to the average photospheric temperature and density values at τ=1. The magnetic field at the lower boundary is driven by horizontal motions mimicking the photospheric horizontal granular motions. This leads to the braiding of ...
study of planetary magnetic fields
... Its field is generated by liquid metallic hydrogen, circulating a rocky core. Its core is heated by gravity pulling helium toward the core, and its rapid rotation. Uranus: The magnetic field of Uranus is a little more complicated than the other planets. Uranus’ magnetic field tilts dramatically and ...
... Its field is generated by liquid metallic hydrogen, circulating a rocky core. Its core is heated by gravity pulling helium toward the core, and its rapid rotation. Uranus: The magnetic field of Uranus is a little more complicated than the other planets. Uranus’ magnetic field tilts dramatically and ...
2 Gamma-Ray Production and Absorption Processes
... energetic particles discovered early in the 20th century in the upper atmosphere of the Earth and known to pervade interstellar space. These particles are called ‘cosmic radiation’ because with their high energies they propagate at the speed of light and in certain aspects behave like photons of sim ...
... energetic particles discovered early in the 20th century in the upper atmosphere of the Earth and known to pervade interstellar space. These particles are called ‘cosmic radiation’ because with their high energies they propagate at the speed of light and in certain aspects behave like photons of sim ...
How the Stanford Linear Accelerator Center is transforming the
... Following the electrons downstream, the biggest change to the linac takes place almost immediately, where bunch compressors will cram the electrons into even tighter packages. This fall and next, during the linac’s scheduled maintenance shutdowns, workers will remove 39 meters of existing accelerato ...
... Following the electrons downstream, the biggest change to the linac takes place almost immediately, where bunch compressors will cram the electrons into even tighter packages. This fall and next, during the linac’s scheduled maintenance shutdowns, workers will remove 39 meters of existing accelerato ...
ASPERA-3: Analyser of Space Plasmas and
... the planet have been developed. In particular, the scavenging of planetary ions may have resulted in the removal of ~1 m of surface water over 4.5 Gyr (Lundin et al., 1991). More detailed studies (Perez-de-Tejada, 1992), taking into account the variability of the ionosphere throughout the planet’s h ...
... the planet have been developed. In particular, the scavenging of planetary ions may have resulted in the removal of ~1 m of surface water over 4.5 Gyr (Lundin et al., 1991). More detailed studies (Perez-de-Tejada, 1992), taking into account the variability of the ionosphere throughout the planet’s h ...
PoS(ICRC2015)509
... of particle acceleration at oblique shocks, in its most basic setup (two-cells acceleration region with flat shock of effective infinite extent). One of the most interesting features of our approach is the use of hydrodynamical simulations of CWB systems, which have been exploited for determining th ...
... of particle acceleration at oblique shocks, in its most basic setup (two-cells acceleration region with flat shock of effective infinite extent). One of the most interesting features of our approach is the use of hydrodynamical simulations of CWB systems, which have been exploited for determining th ...
PDF: 154K
... D4Dcr ¼ p2 for the antisymmetric mode. Numerical solutions of nonlinear equations (3)–(5) have been obtained by Rogachevskii et al. (2006b). The saturated level of the mean magnetic field depends strongly on the value of the turbulent diffusivity of the magnetic helicity kT . The mean magnetic field v ...
... D4Dcr ¼ p2 for the antisymmetric mode. Numerical solutions of nonlinear equations (3)–(5) have been obtained by Rogachevskii et al. (2006b). The saturated level of the mean magnetic field depends strongly on the value of the turbulent diffusivity of the magnetic helicity kT . The mean magnetic field v ...
Spin-Driven Changes in Neutron Star Magnetic Fields
... star’s magnetic field and its spin (Ω). This argument was later strengthened by including the effect of a neutron vortex line’s own strong magnetic field (Ruderman 1991a,b). The core flux is no longer quantized into flux tubes as it passes out of the star through the crust. (Crustal nuclei are thems ...
... star’s magnetic field and its spin (Ω). This argument was later strengthened by including the effect of a neutron vortex line’s own strong magnetic field (Ruderman 1991a,b). The core flux is no longer quantized into flux tubes as it passes out of the star through the crust. (Crustal nuclei are thems ...
MS Word - Boston University
... the flux of 90-degree pitch angle particles. These distributions were present on the night side near the magnetic equatorial plane and were far more prevalent in electrons than in protons. These distributions have been known for some time and have been associated with drift shell splitting in combin ...
... the flux of 90-degree pitch angle particles. These distributions were present on the night side near the magnetic equatorial plane and were far more prevalent in electrons than in protons. These distributions have been known for some time and have been associated with drift shell splitting in combin ...
The role of emerging bipoles in the formation of a sunspot penumbra
... bipoles increases gradually. Finally, the footpoint that has the same polarity as the spot merges with it. From this we envisage that the increase in the area and magnetic flux of the sunspot during our time sequence is due to merging of footpoints from small-scale bipoles: the footpoints with the p ...
... bipoles increases gradually. Finally, the footpoint that has the same polarity as the spot merges with it. From this we envisage that the increase in the area and magnetic flux of the sunspot during our time sequence is due to merging of footpoints from small-scale bipoles: the footpoints with the p ...
Magnetar-driven Hypernovae
... • The Collapsar is promising models for the central engines of GRBs. • Theoretical models are sketchy and numerical simulations are only now beginning to explore them. • Our results suggest that: + Black holes of failed supernovae can drive very powerful GRB jets via Blandford-Znajek mechanism if th ...
... • The Collapsar is promising models for the central engines of GRBs. • Theoretical models are sketchy and numerical simulations are only now beginning to explore them. • Our results suggest that: + Black holes of failed supernovae can drive very powerful GRB jets via Blandford-Znajek mechanism if th ...
ppt - Serbian Virtual Observatory - astronomical observatory belgrade
... • This is a database of calculated widths and shifts of isolated lines of atoms and ions due to electron and ion collisions. This database is devoted to modellisation and spectroscopic diagnostics of stellar atmospheres and envelopes. In addition, it is also devoted to laboratory plasmas, laser equi ...
... • This is a database of calculated widths and shifts of isolated lines of atoms and ions due to electron and ion collisions. This database is devoted to modellisation and spectroscopic diagnostics of stellar atmospheres and envelopes. In addition, it is also devoted to laboratory plasmas, laser equi ...
Evolution of Primordial Magnetic Fields from Phase
... We consider the evolution of primordial magnetic fields generated during cosmological, electroweak or QCD, phase transitions. We assume that the magnetic field generation can be described as an injection of magnetic energy to cosmological plasma at a given scale determined by the moment of magnetic ...
... We consider the evolution of primordial magnetic fields generated during cosmological, electroweak or QCD, phase transitions. We assume that the magnetic field generation can be described as an injection of magnetic energy to cosmological plasma at a given scale determined by the moment of magnetic ...
History and Science Motivation for the Van Allen Probes Mission
... The NASA Van Allen Probes (previously known as Radiation Belt Storm Probes, or RBSP) mission addresses how populations of high-energy charged particles are created, vary, and evolve in space environments, specifically within Earth’s magnetically trapped radiation belts. The Probes were launched 30 A ...
... The NASA Van Allen Probes (previously known as Radiation Belt Storm Probes, or RBSP) mission addresses how populations of high-energy charged particles are created, vary, and evolve in space environments, specifically within Earth’s magnetically trapped radiation belts. The Probes were launched 30 A ...
Steady Stagnation Point Flow and Heat Transfer Over a Shrinking
... The problem of the steady magnetohydrodynamic (MHD) stagnation-point flow of an incompressible, viscous and electrically conducting fluid over a shrinking sheet is studied. The effects of an induced magnetic field and thermal radiation are taken into account. Velocity and thermal slip conditions hav ...
... The problem of the steady magnetohydrodynamic (MHD) stagnation-point flow of an incompressible, viscous and electrically conducting fluid over a shrinking sheet is studied. The effects of an induced magnetic field and thermal radiation are taken into account. Velocity and thermal slip conditions hav ...
Chapter 3 (Lectures 7
... A very interesting question is how the magnetic fields of Ap stars might evolve during the main sequence phase of evolution. Since a star changes its structure rather little during this evolution stage, it might appear that not much change would be expected in the magnetic fields either, but recall ...
... A very interesting question is how the magnetic fields of Ap stars might evolve during the main sequence phase of evolution. Since a star changes its structure rather little during this evolution stage, it might appear that not much change would be expected in the magnetic fields either, but recall ...
Ion-supported tori: a thermal bremsstrahlung model for the X
... emerged in relation to recent discussions of energy advection solutions (see Begelman 1978 and Abramowicz et al. 1988, for high-M, optically thick systems, and Rees et al. 1982; Abramowicz et al. 1995 and Narayan & Yi 1994, 1995a, b for the low-M, optically thin solution relevant here) for accretion ...
... emerged in relation to recent discussions of energy advection solutions (see Begelman 1978 and Abramowicz et al. 1988, for high-M, optically thick systems, and Rees et al. 1982; Abramowicz et al. 1995 and Narayan & Yi 1994, 1995a, b for the low-M, optically thin solution relevant here) for accretion ...
Kinetic simulation of the electron-cyclotron maser instability: effect of
... In this work, we use a different approach. Like in Paper I, the particles and waves are simulated using a kinetic description. The used model does not explicitly include the spatial movement of the particles and waves and their spatial ditributions within the emission source, i.e., the parameters of ...
... In this work, we use a different approach. Like in Paper I, the particles and waves are simulated using a kinetic description. The used model does not explicitly include the spatial movement of the particles and waves and their spatial ditributions within the emission source, i.e., the parameters of ...
Polywell
The polywell is a type of nuclear fusion reactor that uses an electric field to heat ions to fusion conditions. It is closely related to the magnetic mirror, the fusor, the biconic cusp and the high beta fusion reactor. A set of electromagnets generates a magnetic field which traps electrons. This creates a negative voltage, which attracts positive ions. As the ions accelerate towards the negative center, their kinetic energy rises. If the ions collide in the center, they can fuse.The polywell is one of many devices that use an electric field to heat ions to fusion conditions. This branch of fusion research is known as inertial electrostatic confinement. The polywell was developed by Robert Bussard, as an improvement over the fusor. His company, EMC2, Inc., developed the initial devices for the U.S. Navy.