惠斯勒
物理
电子
能量级联
波数
计算物理学
湍流
朗道阻尼
BETA(编程语言)
各向异性
原子物理学
光学
核物理学
机械
计算机科学
程序设计语言
作者
Shinji Saito,S. Peter Gary
出处
期刊:Physics of Plasmas
[American Institute of Physics]
日期:2012-01-01
卷期号:19 (1): 012312-012312
被引量:19
摘要
Two-dimensional particle-in-cell simulations have been carried out to study electron beta dependence of decaying whistler turbulence and electron heating in a homogeneous, collisionless magnetized plasma. Initially, applied whistler fluctuations at relatively long wavelengths cascade their energy into shorter wavelengths. This cascade leads to whistler turbulence with anisotropic wavenumber spectra which are broader in directions perpendicular to the background magnetic field than in the parallel direction. Comparing the development of whistler turbulence at different electron beta values, it is found that both the wavenumber spectrum anisotropy and electron heating anisotropy decrease with increasing electron beta. This indicates that higher electron beta reduces the perpendicular energy cascade of whistler turbulence. Fluctuation energy dissipation by electron Landau damping responsible for the electron parallel heating becomes weaker at higher electron beta, which leads to more isotropic heating. It suggests that electron kinetic processes are important in determining the properties of whistler turbulence. This kinetic property is applied to discuss the generation of suprathermal strahl electron distributions in the solar wind.
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