发表机构
Department of Earth and Planetary Science, The University of Tokyo（东京大学地球行星科学系）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文通过双流体十矩系统线性分析，研究部分电离等离子体中阿尔芬波的阻尼，发现高β等离子体中粘性阻尼主导摩擦阻尼，且与电离度无关，从而影响宇宙射线传播。
AI 中文摘要
我们通过双流体十矩系统的线性分析研究了阿尔芬波的阻尼率。为了在宽频率范围内处理粘性效应，我们考虑了压力张量无迹部分的时间演化。此外，为了在宽电离度范围内处理粘性效应，我们在压力张量无迹部分的方程中考虑了氢原子之间以及质子与氢原子之间的相互作用。我们在某些极限下找到了色散关系的近似解析解。我们在低频极限下的分析表明，在高β等离子体中，粘性阻尼主导摩擦阻尼，这与电离度无关。因此，氢气的粘性显著影响部分电离高β等离子体中宇宙射线的传播。
英文摘要
We investigate the damping rate of Alfvén waves by means of the linear analysis of the two-fluid ten-moments system. To treat effects of viscosity in a wide frequency range, we take account of the time evolution of the traceless part of the pressure tensor. In addition, to treat effects of viscosity in a wide range of the ionization degree, we consider interactions between hydrogen atoms and between protons and hydrogen atoms in the equation of the traceless part of the pressure tensor. We find approximate analytical solutions to the dispersion relation for some limits. Our analysis in the low-frequency limit shows that the viscous damping dominates over the frictional damping in the high-beta plasma, which is independent of the ionization degree. Therefore, the viscosity of hydrogen gas significantly affects cosmic-ray propagation in a partially ionized high-beta plasma.
Comments12 pages, 3 figures, submitted to The Astrophysical Journal
