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arXiv 0902.1710physics.space-ph
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高$β$空间等离子体中的线性镜模阈值

On the linear mirror mode threshold in high-$β$ space plasma

R. A. Treumann, O. D. Constantinescu

摘要:

分析了包含弱漂移和有限拉莫尔半径效应的镜模的线性阈值条件,并给出了任意精度的封闭解析形式。结合磁鞘中的镜像模式的观测结果表明,只有磁“倾角”产生的镜像不稳定性。一个半实验(非线性)阈值条件来自数据。偶尔观察到的所谓“峰值”不能归因于镜像模式。这可能是压缩快模非线性演化的结果。

英文摘要:

The linear threshold condition of the mirror mode including weak drift and finite Larmor radius effects is analysed and shown that it can be given to arbitrary precision in closed analytical form. Combined with observations of mirror modes in the magnetosheath it is shown that only magnetic `dips' are produced by the mirror instability. A semi-experimental (non-linear) threshold condition is derived from the data. The occasionally observed so-called `peaks' cannot be attributed to mirror modes. They result probably from nonlinear evolution of the compressive fast mode.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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