太阳风等离子体中的色散磁化波
Dispersive magnetized waves in the solar wind plasma
摘要：
本文导出了强磁化、可压缩、均匀、各向同性准中性等离子体中波的广义线性色散关系。从描述可区分的电子和离子流体的双流体模型出发，我们得到了磁化波的六阶线性色散关系，该关系包含由于电子和离子惯性、有限等离子体β和相速度的角依赖性的影响。我们调查这些磁化波的传播特性，在一个政权的尺度长度与电子和离子的惯性长度尺度。这种制度基本上对应于太阳风等离子体的长度尺度，与离子回旋频率，导致色散效应。这些尺度与线性波的结合对理解太阳风等离子体中湍流波动的高频、小尺度动力学提出了很大的挑战。
英文摘要：
We derive a generalized linear dispersion relation of waves in a strongly magnetized, compressible, homogeneous and isotropic quasineutral plasma. Starting from a two fluid model, describing distinguishable electron and ion fluids, we obtain a six order linear dispersion relation of magnetized waves that contains effects due to electron and ion inertia, finite plasma beta and angular dependence of phase speed. We investigate propagation characteristics of these magnetized waves in a regime where scale lengths are comparable with electron and ion inertial length scales. This regime corresponds essentially to the solar wind plasma where length scales, comparable with ion cyclotron frequency, lead to dispersive effects. These scales in conjunction with linear waves present a great deal of challenges in understanding the high frequency, small scale dynamics of turbulent fluctuations in the solar wind plasma.
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