Rapid Loss of Relativistic Electrons by EMIC Waves in the Outer Radiation Belt Observed by Arase, Van Allen Probes, and the PWING Ground Stations
Rapid Loss of Relativistic Electrons by EMIC Waves in the Outer Radiation Belt Observed by Arase, Van Allen Probes, and the PWING Ground Stations
复制标题
DOI：
10.1029/2018gl080262
复制
发表时间：
2018-12-16
影响因子：
5.2
通讯作者：
Otsuka, Y.
中科院分区：
文献类型：
--
作者：
Kurita, S.;Miyoshi, Y.;Otsuka, Y.
电磁离子回旋(EMIC)波对相对论电子的俯仰角散射的证据越来越多。理论研究预测了EMIC波对MeV电子的损失时间尺度可以非常快，这表明随着EMIC波的活动，MeV电子通量迅速减少。这项研究基于ARASE、Van Allen探测器和地面网络观测，报道了EMIC波引起的一次独特的MeV电子损失事件。ARASE通过EMIC波观测到了MeV电子损失的特征，卫星和地面观测限制了损失事件期间EMIC波活动的时空变化。对MeV电子通量的多卫星观测表明，在出现EMIC波的几十分钟内，与2.5 MeV类似，电子通量大幅下降。本研究提供了EMIC波对MeV电子损失时间尺度的观测估计。
There has been increasing evidence for pitch angle scattering of relativistic electrons by electromagnetic ion cyclotron (EMIC) waves. Theoretical studies have predicted that the loss time scale of MeV electrons by EMIC waves can be very fast, suggesting that MeV electron fluxes rapidly decrease in association with the EMIC wave activity. This study reports on a unique event of MeV electron loss induced by EMIC waves based on Arase, Van Allen Probes, and ground-based network observations. Arase observed a signature of MeV electron loss by EMIC waves, and the satellite and ground-based observations constrained spatial-temporal variations of the EMIC wave activity during the loss event. Multisatellite observation of MeV electron fluxes showed that similar to 2.5-MeV electron fluxes substantially decreased within a few tens of minutes where the EMIC waves were present. The present study provides an observational estimate of the loss time scale of MeV electrons by EMIC waves.