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题名: Kinetic Properties of an Interplanetary Shock Propagating inside a Coronal Mass Ejection
作者: Liu, Mingzhe; Liu, Ying D.; Yang, Zhongwei; Wilson, L. B., III; Hu, Huidong
作者部门: 空间科学部
通讯作者: Liu, YD (reprint author), Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing 100190, Peoples R China. ; Liu, YD (reprint author), Univ Chinese Acad Sci, Beijing 100049, Peoples R China.
关键词: instabilities ; shock waves ; Sun: coronal mass ejections (CMEs) ; waves
刊名: ASTROPHYSICAL JOURNAL LETTERS
ISSN号: 2041-8205
出版日期: 2018
卷号: 859, 期号:1, 页码:L4
收录类别: SCI
项目资助者: NSFC [41774179, 41374173, 41574140] ; Specialized Research Fund for State Key Laboratories of China
英文摘要: We investigate the kinetic properties of a typical fast-mode shock inside an interplanetary coronal mass ejection (ICME) observed on 1998 August 6 at 1 au, including particle distributions and wave analysis with the in situ measurements from Wind. Key results are obtained concerning the shock and the shock-ICME interaction at kinetic scales: (1) gyrating ions, which may provide energy dissipation at the shock in addition to wave-particle interactions, are observed around the shock ramp; (2) despite the enhanced proton temperature anisotropy of the shocked plasma, the low plasma beta inside the ICME constrains the shocked plasma under the thresholds of the ion cyclotron and mirror-mode instabilities; (3) whistler heat flux instabilities, which can pitch-angle scatter halo electrons through a cyclotron resonance, are observed around the shock, and can explain the disappearance of bi-directional electrons (BDEs) inside the ICME together with normal betatron acceleration; (4) whistler waves near the shock are likely associated with the whistler heat flux instabilities excited at the shock ramp, which is consistent with the result that the waves may originate from the shock ramp; (5) the whistlers share a similar characteristic with the shocklet whistlers observed by Wilson et al., providing possible evidence that the shock is decaying because of the strong magnetic field inside the ICME.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.nssc.ac.cn/handle/122/6325
Appears in Collections:空间科学部_期刊论文

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