Kinetic slow mode-type solitons
Kinetic slow mode-type solitons
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动力学慢模型孤子
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
E. Dubinin
中科院分区：
文献类型：
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作者：
K. Baumgärtel;K. Sauer;E. Dubinin
提出了一维混合代码模拟，以便研究各向同性、无碰撞、中β等离子体（β i =0.25）中慢模式分支的孤立波，并根据动力学理论测试基于流体的孤子解释（Stasiewicz et al., 2003; Stasiewicz, 2004）。在模拟中，可以看到各种强倾斜、大振幅的孤子，包括与Hall-MHD理论预测的Alfvenic极化孤子，以及具有强磁场洼地和垂直离子加热的慢磁子型的鲁强、几乎不传播的孤子结构，这在流体理论中是没有对应的。这些结果支持了对星系团观测的基于孤子的解释，但揭示了Hall-MHD理论在描述中等β等离子体中的慢模孤子方面的实质性缺陷。
One-dimensional hybrid code simulations are presented, carried out in order both to study solitary waves of the slow mode branch in an isotropic, collisionless, medium-β plasma (β i =0.25) and to test the fluid based soliton interpretation of Cluster observed strong magnetic depressions (Stasiewicz et al., 2003; Stasiewicz, 2004) against kinetic theory. In the simulations, a variety of strongly oblique, large amplitude, solitons are seen, including solitons with Alfvenic polarization, similar to those predicted by the Hall-MHD theory, and robust, almost non-propagating, solitary structures of slow magnetosonic type with strong magnetic field depressions and perpendicular ion heating, which have no counterpart in fluid theory. The results support the soliton-based interpretation of the Cluster observations, but reveal substantial deficiencies of Hall-MHD theory in describing slow mode-type solitons in a plasma of moderate beta.