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arXiv physics/9711002physics.plasm-ph
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多离子等离子体中的非线性磁声波

Nonlinear Magnetosonic Waves in a Multi-Ion-Species Plasma

S. A. Boldyrev

摘要:

磁声波由于其在空间等离子体中的重要性而被深入研究,并且在聚变等离子体中也被用于粒子加速和加热实验。本文研究了垂直于外磁场的多离子等离子体中磁声波的传播。由于存在几种离子种类,该模式分为两个分支:高频和低频模式。这打开了一个新的渠道的非线性相互作用(这两种模式之间),定性地改变了图片中的湍流长波区域。使用精确的动力学方法,我们推导出一个一般的系统,描述非线性耦合的高,低频波的传播。该系统包括KdV,Boussinesq和Zakharov方程作为极限情况。得到了耦合方程组的孤立子解。

英文摘要:

Magnetosonic waves are intensively studied due to their importance in space plasmas and also in fusion plasmas where they are used in particle acceleration and heating experiments. In the present paper we investigate the magnetosonic waves propagating in a multi-ion-species plasma perpendicular to an external magnetic field. Due to the presence of several ion species, this mode splits into two branches: high- and low-frequency modes. This opens a new channel of nonlinear interactions (between these two modes), and qualitatively changes the picture of turbulence in the long-wave region. Using the exact kinetic approach, we derive a general system describing the propagation of nonlinearly coupled high- and low-frequency waves. This system includes the KdV, Boussinesq, and Zakharov equations as limiting cases. Solitary solutions of the system of coupled equations are obtained.

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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