Nonlinear dissipation of circularly polarized Alfvén waves due to the beam-induced obliquely propagating waves
Nonlinear dissipation of circularly polarized Alfvén waves due to the beam-induced obliquely propagating waves
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DOI：
10.1063/1.4748296
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发表时间：
2012-08
影响因子：
2.2
通讯作者：
Y. Nariyuki;T. Hada;K. Tsubouchi
中科院分区：
文献类型：
--
作者：
Y. Nariyuki;T. Hada;K. Tsubouchi
本文利用二维混合模拟程序，数值研究了含有束流分量的太阳风等离子体中圆极化Alfven波的耗散过程。数值结果表明，由于束流诱导的斜传播波的存在，母体Alfven波被迅速消散，例如动力学Alfven波。利用母波的感应方程直接计算了非线性波波耦合。在一维和二维模拟中也观察到，大振幅Alfven波的存在强烈地抑制了束流不稳定性。
In the present study, the dissipation processes of circularly polarized Alfven waves in solar wind plasmas including beam components are numerically discussed by using a 2-D hybrid simulation code. Numerical results suggest that the parent Alfven waves are rapidly dissipated due to the presence of the beam-induced obliquely propagating waves, such as kinetic Alfven waves. The nonlinear wave-wave coupling is directly evaluated by using the induction equation for the parent wave. It is also observed both in the 1-D and 2-D simulations that the presence of large amplitude Alfven waves strongly suppresses the beam instabilities.