Parameteric studies of nonlinear oblique magnetosonic waves in two-ion-species plasmas
Parameteric studies of nonlinear oblique magnetosonic waves in two-ion-species plasmas
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DOI：
10.1063/1.3596381
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发表时间：
2011-06
影响因子：
2.2
通讯作者：
M. Toida;Y. Kondo
中科院分区：
文献类型：
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作者：
M. Toida;Y. Kondo
双离子等离子体中离子成分对垂直磁声波影响的研究[M. Toida，H. Higashino和Y. Ohsawa，J. Phys. Soc. Jpn. 76，104052（2007）]扩展到包括斜波。首先，KdV方程的低频和高频模式是有效的必要条件进行了分析。低频模脉冲幅度的上限表示为两种离子的传播角θ、密度比和回旋频率比的函数。其次，利用电磁粒子模拟方法，研究了在不同离子密度和回旋频率比的两种等离子体中，长波长低频模扰动随θs的非线性演化，证实了低频模脉冲的理论。它还表明，如果脉冲振幅超过振幅的上限的理论值，那么更短的波长的低频和高频模式波产生。
The study of the effects of ion composition on perpendicular magnetosonic waves in two-ion-species plasmas [M. Toida, H. Higashino, and Y. Ohsawa, J. Phys. Soc. Jpn. 76, 104052 (2007)] is extended to include oblique waves. First, the conditions necessary for KdV equations for low- and high-frequency modes to be valid are analytically obtained. The upper limit of the amplitude of the low-frequency-mode pulse is expressed as a function of the propagation angle θ, density ratio, and cyclotron frequency ratio of the two ion species. Next, with electromagnetic particle simulations, the nonlinear evolution of a long-wavelength low-frequency-mode disturbance is examined for various θs in two plasmas with different ion densities and cyclotron frequency ratios, and the theory for the low-frequency-mode pulse is confirmed. It is also shown that if the pulse amplitude exceeds the theoretical value of the upper limit of the amplitude, then shorter-wavelength low- and high-frequency-mode waves are generated.