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DOI	10.1029/2020GL090027
	Relation Between Shock-Related Impulse and Subsequent ULF Wave in the Earth's Magnetosphere
	Zhang D.; Liu W.; Li X.; Sarris T.E.; Wang Y.; Xiao C.; Zhang Z.; Wygant J.R.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:23
英文摘要	The generation of Pc4-5 ultralow frequency (ULF) waves after interplanetary shock-induced electric field impulses in the Earth's magnetosphere is studied using Van Allen Probes measurements by investigating the relationship between the first impulses and subsequent resonant ULF waves. In the dayside, the relevant time scales of the first impulse is correlated better with local Alfvén speed than with local eigenfrequency, implying that the temporal scale of the first impulse is more likely related to fast-mode wave propagation rather than local field line resonance. There are only 20 out of 51 events with narrow-band poloidal ULF waves induced after the first impulse, showing a higher chance for ULF wave generation at the locations where the impulse equivalent frequency scale matches the local eigenfrequency. It is suggested that the shock-related ULF wave can be excited in the magnetosphere on condition that shock-induced impulse has large enough amplitude with its frequency matching the local eigenfrequency. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Electric fields; Wave propagation; Earth's magnetosphere; Eigenfrequency; Frequency matching; Frequency scale; Interplanetary shocks; Shock induced; Temporal scale; Ultra low frequencies; Magnetosphere; amplitude; electric field; electromagnetic field; frequency analysis; geomagnetic field; magnetosphere; wave generation; wave propagation
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169360
作者单位	School of Space and Environment, Beihang University, Beijing, China; Key Laboratory of Space Environment Monitoring and Information Processing of MIIT, Beihang University, Beijing, China; Laboratory for Atmospheric and Space Physics, University of Colorado Boulder, Boulder, CO, United States; Department of Electrical and Computer Engineering, Democritus University of Thrace, Xanthi, Greece; Institute of Space Physics and Applied Technology, Peking University, Beijing, China; School of Physics and Astronomy, University of Minnesota, Twin Cities, Minneapolis, MN, United States
推荐引用方式 GB/T 7714	Zhang D.,Liu W.,Li X.,et al. Relation Between Shock-Related Impulse and Subsequent ULF Wave in the Earth's Magnetosphere[J],2020,47(23).
APA	Zhang D..,Liu W..,Li X..,Sarris T.E..,Wang Y..,...&Wygant J.R..(2020).Relation Between Shock-Related Impulse and Subsequent ULF Wave in the Earth's Magnetosphere.Geophysical Research Letters,47(23).
MLA	Zhang D.,et al."Relation Between Shock-Related Impulse and Subsequent ULF Wave in the Earth's Magnetosphere".Geophysical Research Letters 47.23(2020).