Electron dropout echoes induced by interplanetary shock: A statistical   study

doi:10.1002/2017JA024045

CORC > 北京大学 > 地球与空间科学学院

	Electron dropout echoes induced by interplanetary shock: A statistical study
	Liu, Z. Y. ; Zong, Q.G. ; Hao, Y. X. ; Zhou, X.Z. ; Ma, X. H. ; Liu, Y.
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
	2017
关键词	electron dropout echoes energetic particle solar wind-magnetospheric coupling interplanetary shock dawn-dusk asymmetry INNER MAGNETOSPHERE GEOSYNCHRONOUS ORBIT MAGNETIC-FIELD FLUX DROPOUTS INJECTIONS EVENT
DOI	10.1002/2017JA024045
英文摘要	"Electron dropout echo" as indicated by repeated moderate dropout and recovery signatures of the flux of energetic electron in the outer radiation belt region has been investigated systematically. The electron moderate dropout and its echoes are usually found for higher-energy (>300 keV) channel fluxes, whereas the flux enhancements are obvious for lower energy electrons simultaneously after the interplanetary shock arrives at the Earth's geosynchronous orbit. The electron dropout echo events are found to be usually associated with the interplanetary shocks arrival. The 104 dropout echo events have been found from 215 interplanetary shock events from 1998 to 2007 based on the Los Alamos National Laboratory satellite data. In analogy to substorm injections, these 104 events could be naturally divided into two categories: dispersionless (49 events) or dispersive (55 events) according to the energy dispersion of the initial dropout. It is found that locations of dispersionless events are distributed mainly in the duskside magnetosphere. Further, the obtained locations derived from dispersive events with the time-of-flight technique of the initial dropout regions are mainly located at the duskside as well. Statistical studies have shown that the effect of shock normal, interplanetary magnetic field B-z and solar wind dynamic pressure may be insignificant to these electron dropout events. We suggest that the similar to 1 min electric field impulse induced by the interplanetary shock produces a more pronounced inward migration of electrons at the duskside, resulting in the observed duskside moderate dropout of electron flux and its consequent echoes.; National Natural Science Foundation of China [41421003, 41627805]; SCI(E); ARTICLE; 8; 8037-8050; 122
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/471629]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Liu, Z. Y.,Zong, Q.G.,Hao, Y. X.,et al. Electron dropout echoes induced by interplanetary shock: A statistical study[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2017.
APA	Liu, Z. Y.,Zong, Q.G.,Hao, Y. X.,Zhou, X.Z.,Ma, X. H.,&Liu, Y..(2017).Electron dropout echoes induced by interplanetary shock: A statistical study.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS.
MLA	Liu, Z. Y.,et al."Electron dropout echoes induced by interplanetary shock: A statistical study".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS (2017).