Disappearance of plasmaspheric hiss following interplanetary shock: DISAPPEARANCE OF PLASMASPHERIC HISS
Disappearance of plasmaspheric hiss following interplanetary shock: DISAPPEARANCE OF PLASMASPHERIC HISS
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DOI：
10.1002/2015gl063906
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发表时间：
2015-05
影响因子：
5.2
通讯作者：
Z. Su;Hui Zhu;F. Xiao;Huinan Zheng;Yuming Wang;C. Shen;Min Zhang;Shui Wang;C. Kletzing;W. Kurth;G. Hospodarsky;H. Spence;G. Reeves;H. Funsten;J. Blake;D. Baker;J. Wygant
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文献类型：
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作者：
Z. Su;Hui Zhu;F. Xiao;Huinan Zheng;Yuming Wang;C. Shen;Min Zhang;Shui Wang;C. Kletzing;W. Kurth;G. Hospodarsky;H. Spence;G. Reeves;H. Funsten;J. Blake;D. Baker;J. Wygant
等离子体噪声是控制辐射带动力学的重要等离子体波之一。其时空分布和产生机制是目前研究的热点。我们在此首次报道了范艾伦探测器在2013年10月8日观测到的由激波引起的等离子体嘶嘶消失。这一特殊事件显示了等离子体嘶嘶的巨大变异性，为测试其产生机制提供了一个很好的机会。等离子体的嘶嘶声起源于等离子体合唱，这被认为是解释这一事件的一个适当的先决条件。激波增加了超热电子通量，然后增强的朗道阻尼迅速阻止合唱波进入等离子层。随后，磁层顶的收缩使源电子消失，导致等离子体层的嘶嘶声持续数小时。
Plasmaspheric hiss is one of the important plasma waves controlling radiation belt dynamics. Its spatiotemporal distribution and generation mechanism are presently the object of active research. We here give the first report on the shock‐induced disappearance of plasmaspheric hiss observed by the Van Allen Probes on 8 October 2013. This special event exhibits the dramatic variability of plasmaspheric hiss and provides a good opportunity to test its generation mechanisms. The origination of plasmaspheric hiss from plasmatrough chorus is suggested to be an appropriate prerequisite to explain this event. The shock increased the suprathermal electron fluxes, and then the enhanced Landau damping promptly prevented chorus waves from entering the plasmasphere. Subsequently, the shrinking magnetopause removed the source electrons for chorus, contributing significantly to the several‐hours‐long disappearance of plasmaspheric hiss.