Nonlinear interactions between relativistic radiation belt electrons and oblique whistler mode waves
Nonlinear interactions between relativistic radiation belt electrons and oblique whistler mode waves
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DOI：
10.5194/npg-17-599-2010
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发表时间：
2010-10
影响因子：
2.2
通讯作者：
X. Tao;J. Bortnik
中科院分区：
文献类型：
--
作者：
X. Tao;J. Bortnik
抽象。本文研究了相对论带电粒子与斜哨声波的共振相互作用，结果表明，非线性相位俘获可以发生在陀螺相位平均的意义上，这与以前非相对论电子与斜哨声波相互作用的研究结果一致。导出了一个无量纲参数χ来表示粒子的波致运动与绝热运动之比。我们表明，相位捕获是可能发生时，波致运动占主导地位的绝热运动，这是主要由背景场造成的。基于参数χ示出了非线性相互作用的可能区域的映射。我们发现，非线性相互作用可能是重要的赤道平面附近，甚至中等波振幅，和纬度范围内发生的非线性相互作用是最大的电子与当地的俯仰角约50度，与以前的研究结果一致。这些结果对于理解相对论辐射带电子的非线性动力学和合唱波的产生具有重要意义。
Abstract. Resonant interactions between relativistic charged particles and oblique whistler mode waves are explored in this work, and it is shown that nonlinear phase trapping could happen in a gyrophase averaged sense, consistent with previous studies of interactions between nonrelativistic electrons and oblique whistler mode waves. A dimensionless parameter χ is derived to represent the ratio of wave-induced motion to the adiabatic motion of the particle. We show that phase trapping is likely to occur when the wave-induced motion dominates the adiabatic motion, which is caused mainly by the background fields. A mapping of probable regions of nonlinear interactions is shown based on the parameter χ. We show that the nonlinear interactions might be important near the equatorial plane for even moderate wave amplitude, and the latitudinal range for nonlinear interactions to occur is largest for electrons with local pitch angles around 50 degrees, consistent with previous findings. The results are important for understanding the nonlinear dynamics of relativistic radiation belt electrons and the generation of chorus waves.