PIC simulations of the Thermal Anisotropy-Driven Weibel Instability: Field growth and phase space evolution upon saturation - Astrophysics > Astrophysics of GalaxiesReportar como inadecuado




PIC simulations of the Thermal Anisotropy-Driven Weibel Instability: Field growth and phase space evolution upon saturation - Astrophysics > Astrophysics of Galaxies - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Abstract: The Weibel instability is investigated with PIC simulations of an initiallyunmagnetized and spatially uniform electron plasma. This instability, which isdriven by the thermally anisotropic electron distribution, generateselectromagnetic waves with wave vectors perpendicular to the direction of thehigher temperature. Two simulations are performed: A 2D simulation, with asimulation plane that includes the direction of higher temperature,demonstrates that the wave spectrum is initially confined to one dimension. Theelectric field components in the simulation plane generated by the instabilityequalize at the end of the simulation through a secondary instability. A 1D PICsimulation with a high resolution, where the simulation box is aligned with thewave vectors of the growing waves, reveals details of the electron phase spacedistribution and permits a comparison of the magnetic and electric fields whenthe instability saturates. It is shown that the electrostatic field is drivenby the magnetic pressure gradient and that it and the magnetic fieldredistribute the electrons in space.



Autor: A Stockem, M E Dieckmann, R Schlickeiser

Fuente: https://arxiv.org/



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