NSSC OpenIR  > 空间科学部
Evidence of kinetic Alfven eigenmode in the near-Earth magnetotail during substorm expansion phase
Duan, S. P.; Dai, Lei; Wang, Chi; Liang, J.; Lui, A. T. Y.; Chen, L. J.; He, Z. H.; Zhang, Y. C.; Angelopoulos, V.; Duan, SP; Dai, L (reprint author), Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing, Peoples R China.
Department空间科学部
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
2016
Volume121Issue:5Pages:4316-4330
ISSN2169-9380
Language英语
KeywordKinetic Alfven Wave Substorm Hall Current Aurora Brightening Hall Fields
AbstractUnipolar pulses of kinetic Alfven waves (KAW) are first observed in the near-Earth plasma sheet (NEPS) associated with dipolarizations during substorm expansion phases. Two similar events are studied with Time History of Events and Macroscale Interactions during Substorms (THEMIS) observations during substorms on 3 February 2008 and 7 February 2008. The unipolar pulses were located at a trough-like Alfven speed profile in the northern plasma sheet at a distance of 10-11R(E) from Earth. The dominant wave components consist of a southward E-z toward the neutral plane and a +B-y toward the dusk. The |E-z|/|B-y| ratio was in the range of a few times the local Alfven speed, a strong indication of KAW nature. The wave Poynting flux was earthward and nearly parallel to the background magnetic field. The pulse was associated with an earthward field-aligned current carried by electrons. These observational facts strongly indicate a KAW eigenmode that is confined by the plasma sheet but propagates earthward along the field line. The KAW eigenmode was accompanied by short timescale (1min) dipolarizations likely generated by transient magnetotail reconnection. The observed polarity of the KAW field/current is consistent with that of the Hall field/current in magnetic reconnection, supporting the scenario that the Hall fields/current propagate out from reconnection site as KAW eigenmodes. Aurora images on the footprint of THEMIS spacecraft suggest that KAW eigenmode may power aurora brightening during substorm expansion phase.
Indexed BySCI
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/5593
Collection空间科学部
Corresponding AuthorDuan, SP; Dai, L (reprint author), Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing, Peoples R China.
Recommended Citation
GB/T 7714
Duan, S. P.,Dai, Lei,Wang, Chi,et al. Evidence of kinetic Alfven eigenmode in the near-Earth magnetotail during substorm expansion phase[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2016,121(5):4316-4330.
APA Duan, S. P..,Dai, Lei.,Wang, Chi.,Liang, J..,Lui, A. T. Y..,...&Dai, L .(2016).Evidence of kinetic Alfven eigenmode in the near-Earth magnetotail during substorm expansion phase.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,121(5),4316-4330.
MLA Duan, S. P.,et al."Evidence of kinetic Alfven eigenmode in the near-Earth magnetotail during substorm expansion phase".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 121.5(2016):4316-4330.
Files in This Item:
File Name/Size DocType Version Access License
2016jgra52602.pdf(5458KB)期刊论文作者接受稿开放获取CC BY-NC-SAApplication Full Text
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Duan, S. P.]'s Articles
[Dai, Lei]'s Articles
[Wang, Chi]'s Articles
Baidu academic
Similar articles in Baidu academic
[Duan, S. P.]'s Articles
[Dai, Lei]'s Articles
[Wang, Chi]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Duan, S. P.]'s Articles
[Dai, Lei]'s Articles
[Wang, Chi]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.