Precipitation loss of Van Allen radiation belt electrons by hiss waves outside the plasmasphere
Precipitation loss of Van Allen radiation belt electrons by hiss waves outside the plasmasphere
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等离子层外嘶嘶声波导致范艾伦辐射带电子的沉淀损失
DOI：
10.1007/s10509-018-3279-0
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发表时间：
2018-03
影响因子：
1.9
通讯作者：
Cao Yong
中科院分区：
文献类型：
--
作者：
He Zhaoguo;Yan Qi;Ma Yonghui;Cao Yong
等离子体层的嘶嘶声波经常被用来解释辐射带电子的缓慢损失。然而，等离子层外的嘶嘶波对辐射带电子的影响仍不清楚。在这里，货车艾伦探针的观测和准线性模拟的基础上，我们表明，嘶嘶声波外的等离子体能够导致显着的高能电子的降水损失的时间尺度为1天。在感兴趣的事件中，嘶嘶波功率谱密度达到，并发现所获得的俯仰角扩散系数大于动量和交叉扩散系数的倍。在一天的时间内，模拟的嘶嘶声波导致300-500 keV电子的损耗高达10倍。这些结果表明，在未来的辐射带模拟中，应考虑等离子体层外的嘶嘶波。
Plasmaspheric hiss waves have been frequently invoked to explain the slow loss of the radiation belt electrons. However, the effect of hiss waves outside the plasmasphere on the radiation belt electrons remains unclear. Here, on the basis of Van Allen Probes observations and quasilinear simulations, we show that the hiss waves outside the plasmasphere are able to cause the significant precipitation loss of energetic electrons on a timescale of 1 day. In the event of interest, the hiss wave power spectra density reached up to, and the obtained pitch-angle diffusion coefficients are found to be–times larger than the momentum and cross diffusion coefficients. During a period of 1 day, the modeled hiss waves caused the depletion of 300–500 keV electrons by up to 10 times. These results suggest that the hiss waves outside the plasmasphere should be taken into account in the future radiation belt modeling.
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