Oxygen Ion Reflection at Earthward Propagating Dipolarization Fronts in the Magnetotail

doi:10.1029/2018JA025689

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 中国科学院地球与行星物理重点实验室

	Oxygen Ion Reflection at Earthward Propagating Dipolarization Fronts in the Magnetotail
	Zhao, S. J.1; Fu, S. Y.1; Sun, W. J.2,3; Parks, G. K.4; Zhou, X. Z.1; Pu, Z. Y.1; Zhao, D.1; Wu, T.1; Yu, F. B.1; Zong, Q. G.1
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
	2018-08-01
卷号	123 期号:8 页码:6277-6288
关键词	oxygen ions dipolarization front flux dropout reflection process
ISSN号	2169-9380
DOI	10.1029/2018JA025689
英文摘要	A dipolarization front (DF) is known as the leading edge of an earthward high-speed flow with a sharp enhancement in the northward magnetic field (B-z). Analysis of an event observed by Cluster shows that the behavior of oxygen ions (O+) around the DF is very different from protons (H+). After the crossing of the DF, the O+ density decreases more gradually than H+. The distance between the density minimum of O+ and the DF layer is similar to 4 times longer than that of H+, which is close to their gyroradii ratio with the same energy. A flux dropout is observed in the O+ energy spectrum, whose energy dependence indicates that ions with higher energies can reach locations farther tailward of the DF. Similar variations are also seen in studies of 22 events in which a common pattern of ion properties is obtained by performing a superposed epoch analysis. Finally, using backward tracing test-particle simulations, we reproduce the characteristics of the flux dropout and verify that the time dependence of the dropout is highly correlated with the gyromotion of different energy O+ behind the DF. All these results provide a further understanding of ion dynamics associated with DFs and suggest that the observed O+ ions are reflected within a half gyromotion in the central plasma sheet.
资助项目	National Natural Science Foundation of China[41474139] ; National Natural Science Foundation of China[41731068] ; National Natural Science Foundation of China[41704163] ; National Postdoctoral Program for Innovative Talents[BX201600158] ; China Postdoctoral Science Foundation[2016M600124]
WOS关键词	PLASMA SHEET ; MAGNETIC-FIELD ; CLUSTER ; ACCELERATION ; RECONNECTION ; MAGNETOSPHERE ; ORIGIN ; FLOWS ; O+
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000445731300013
资助机构	National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Postdoctoral Program for Innovative Talents ; National Postdoctoral Program for Innovative Talents ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Postdoctoral Program for Innovative Talents ; National Postdoctoral Program for Innovative Talents ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Postdoctoral Program for Innovative Talents ; National Postdoctoral Program for Innovative Talents ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Postdoctoral Program for Innovative Talents ; National Postdoctoral Program for Innovative Talents ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/89216]
专题	地质与地球物理研究所_中国科学院地球与行星物理重点实验室
通讯作者	Fu, S. Y.
作者单位	1.Peking Univ, Sch Earth & Space Sci, Beijing, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing, Peoples R China 3.Univ Michigan, Dept Climate & Space Sci & Engn, Ann Arbor, MI 48109 USA 4.Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA
推荐引用方式 GB/T 7714	Zhao, S. J.,Fu, S. Y.,Sun, W. J.,et al. Oxygen Ion Reflection at Earthward Propagating Dipolarization Fronts in the Magnetotail[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2018,123(8):6277-6288.
APA	Zhao, S. J..,Fu, S. Y..,Sun, W. J..,Parks, G. K..,Zhou, X. Z..,...&Zong, Q. G..(2018).Oxygen Ion Reflection at Earthward Propagating Dipolarization Fronts in the Magnetotail.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,123(8),6277-6288.
MLA	Zhao, S. J.,et al."Oxygen Ion Reflection at Earthward Propagating Dipolarization Fronts in the Magnetotail".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 123.8(2018):6277-6288.