Relativistic particle acceleration in the process of whistler‐mode chorus wave generation
Relativistic particle acceleration in the process of whistler‐mode chorus wave generation
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DOI：
10.1029/2007gl029758
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发表时间：
2007-07
影响因子：
5.2
通讯作者：
Y. Katoh;Y. Omura
中科院分区：
文献类型：
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作者：
Y. Katoh;Y. Omura
我们发现，共振电子的有效加速发生在重现哨声模式合唱发射的自洽粒子模拟中。虽然大多数电子失去了有助于产生合唱发射的能量，但具有大俯仰角的一小部分共振电子同时通过产生的合唱发射的非线性波陷阱而被激发。在2500Ωe0−1过程中，有一小部分高能电子在100keV以上被激发。我们还发现这种加速电子在加速过程中表现出从赤道向极地运动的特征行为，这可以用相对论转向加速过程来解释。本研究阐明了非线性俘获在相对论电子窄带哨声合唱激发过程中的重要作用。
We have found that efficient acceleration of resonant electrons takes place in a self‐consistent particle simulation reproducing whistler‐mode chorus emissions. While the majority of electrons lose energy contributing to the generation of chorus emissions, a fraction of resonant electrons having large pitch angle are simultaneously energized through nonlinear wave trapping by the generated chorus emissions. A small fraction of energetic electrons are energized over 100 keV during 2500 Ωe0−1. We also find that such accelerated electrons show a characteristic behavior turning their motion from equatorward to poleward during the acceleration process, which is explained by the relativistic turning acceleration (RTA) process. The present study clarifies that the role of nonlinear wave trapping is significant in the energization process of relativistic electrons by narrowband whistler‐mode chorus emissions.