Mode conversion from kinetic Alfvén waves to modified electron acoustic waves
Mode conversion from kinetic Alfvén waves to modified electron acoustic waves
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DOI：
10.1063/5.0093193
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发表时间：
2022-08
影响因子：
2.2
通讯作者：
R. Shi;Jun Liang
中科院分区：
文献类型：
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作者：
R. Shi;Jun Liang
基于一个包含两个电子布居的多流体模型，研究了从动力学Alfvén波到修正电子声波的可能模式转换。当动力学阿尔文波通过热电子主导区和冷电子主导区之间的过渡传播时，模式转换发生。结果表明，模式转换和动力学Alfvén波反射强烈依赖于热电子的惯性长度，热电子的温度，和垂直波长。结果表明，这种转换是普遍存在的电子温度存在一个陡峭的梯度，例如，在行星极光加速区或在太阳日冕的边界。
Possible mode conversion from kinetic Alfvén wave to modified electron acoustic wave is examined based on a multi-fluid model involving two electron populations. The mode conversion transpires when a kinetic Alfvén wave propagates through a transition between a hot-electron-dominant region and a cold-electron-dominant region. It is shown that the mode conversion and the kinetic Alfvén wave reflection depend strongly on the hot electron inertial length, the hot electron temperature, and the perpendicular wavelength. The results suggest that such conversion is ubiquitous whenever a steep gradient of electron temperature exists, for example, in the planetary auroral acceleration regions or at the boundary of the solar corona.