Chorus acceleration of relativistic electrons in extremely low L-shell during geomagnetic storm of August 2018
Chorus acceleration of relativistic electrons in extremely low L-shell during geomagnetic storm of August 2018
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2018年8月地磁暴期间极低L壳层中相对论电子的合唱加速
DOI：
10.1029/2019gl086226
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发表时间：
2020
影响因子：
5.2
通讯作者：
Shen Xuhui
中科院分区：
文献类型：
--
作者：
Zhang Zhenxia;Chen Lunjin;Liu Si;Xiong Ying;Li Xinqiao;Wang Yongfu;Chu Wei;Zeren Zhima;Shen Xuhui
基于范艾伦探测器和ZH-1卫星的数据，在2018年8月的主要地磁风暴（最小Dst≈−190 nT）期间，观测到极低L壳区（达到L ~ 3）的相对论性电子增强。与外带发生的情况相反，这种强烈而深入的电子穿透事件是罕见的，而且更有趣。在极低的L-壳层（达到L ~ 2.5）中，等离子体顶被抑制，同时也观察到强烈的哨声模式（合唱和嘶嘶）波，振幅为81-126 pT。弹跳平均扩散系数的计算表明，即使在低l壳层中，合唱波也能在风暴期间对1 - 3mev电子的扩散和加速中发挥重要作用。这是第一次报道在极低l壳层区由合唱波引起的电子加速。这一新发现将有助于深入理解辐射带物理中的电子加速过程。
Based on data from the Van Allen Probes and ZH-1 satellites, relativistic electron enhancements in extremely low L-shell regions (reaching L ∼ 3) were observed during August 2018 major geomagnetic storm (minimum Dst ≈ −190 nT). Contrary to what occurs in the outer belt, such an intense and deep electron penetration event is rare and more interesting. Strong whistler-mode (chorus and hiss) waves, with amplitudes 81–126 pT, were also observed in the extremely low L-shell simultaneously (reaching L ∼ 2.5) where the plasmapause was suppressed. The bounce-averaged diffusion coefficient calculations support that the chorus waves can play a significantly important role in diffusing and accelerating the 1–3 MeV electrons even in such low L-shells during storms. This is the first time that the electron acceleration induced by chorus waves in the extremely low L-shell region is reported. This new finding will help to deeply understand the electron acceleration process in radiation belt physics.