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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
2018-08-01
发表期刊JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
ISSN2169-9380
卷号123期号:8页码:6277-6288
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.
关键词oxygen ions dipolarization front flux dropout reflection process
DOI10.1029/2018JA025689
资助者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
关键词[WOS]PLASMA SHEET ; MAGNETIC-FIELD ; CLUSTER ; ACCELERATION ; RECONNECTION ; MAGNETOSPHERE ; ORIGIN ; FLOWS ; O+
语种英语
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]
资助者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
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
WOS记录号WOS:000445731300013
出版者AMER GEOPHYSICAL UNION
引用统计
文献类型期刊论文
条目标识符http://ir.iggcas.ac.cn/handle/132A11/89216
专题地球与行星物理院重点实验室
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
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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.
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