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Tailward leap of multiple expansions of the plasma sheet during a moderately intense substorm: THEMIS observations
Ma, Yonghui; Shen, Chao; Angelopoulos, V.; Lui, A. T. Y.; Li, Xinlin; Frey, H. U.; Dunlop, M.; Auster, H. U.; McFadden, J. P.; Larson, D.; Ma, YH (reprint author), Chinese Acad Sci, Ctr Space Sci & Appl Res, State Key Lab Space Weather, Beijing 100190, Peoples R China.
Department空间科学部
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
2012
Volume117Pages:A07219
ISSN2169-9380
Language英语
AbstractA moderately intense substorm on 1 March 2008, from 0830 to 1000 UT, observed by THEMIS probes and the Ground Based Observatory (GBO) is examined to investigate the global evolution of substorm phenomena. During this interval, all five THEMIS probes are closely aligned along the tail axis near midnight covering a radial range from similar to 9 Re to similar to 18 Re. After the substorm onset, plasma sheet expansions take place successively at multiple locations in the magnetotail as measured by different probes. The positions of the plasma sheet expansions have a tailward leap progression with an average velocity of similar to 36 km/s. There are two types of dipolarization detected in this substorm. The first type is the dipolarization front which is associated with the bursty bulk flow (BBF). While the second type, which we call 'global dipolarization', is associated with plasma sheet expansions. In the substorm studied, there are four intensifications as shown in the THEMIS AE index. We can detect the effects of localized and short-lived magnetic energy release processes occurring in the magnetotail corresponding to each of the four AE intensifications. Furthermore, the inner four probes can detect the global dipolarization signatures similar to 4-15 min earlier than plasma sheet expansions, while the outermost probe (P1) cannot detect this before the plasma sheet expansion. These two phenomena are caused by the same process (magnetic energy release process) but the effects detected by probes locally appear delayed. The observations in this case are not sufficient to distinguish between the two competing substorm models.; A moderately intense substorm on 1 March 2008, from 0830 to 1000 UT, observed by THEMIS probes and the Ground Based Observatory (GBO) is examined to investigate the global evolution of substorm phenomena. During this interval, all five THEMIS probes are closely aligned along the tail axis near midnight covering a radial range from similar to 9 Re to similar to 18 Re. After the substorm onset, plasma sheet expansions take place successively at multiple locations in the magnetotail as measured by different probes. The positions of the plasma sheet expansions have a tailward leap progression with an average velocity of similar to 36 km/s. There are two types of dipolarization detected in this substorm. The first type is the dipolarization front which is associated with the bursty bulk flow (BBF). While the second type, which we call 'global dipolarization', is associated with plasma sheet expansions. In the substorm studied, there are four intensifications as shown in the THEMIS AE index. We can detect the effects of localized and short-lived magnetic energy release processes occurring in the magnetotail corresponding to each of the four AE intensifications. Furthermore, the inner four probes can detect the global dipolarization signatures similar to 4-15 min earlier than plasma sheet expansions, while the outermost probe (P1) cannot detect this before the plasma sheet expansion. These two phenomena are caused by the same process (magnetic energy release process) but the effects detected by probes locally appear delayed. The observations in this case are not sufficient to distinguish between the two competing substorm models.
Indexed BySCI
Funding Project中国科学院空间科学与应用研究中心
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/3197
Collection空间科学部
Corresponding AuthorMa, YH (reprint author), Chinese Acad Sci, Ctr Space Sci & Appl Res, State Key Lab Space Weather, Beijing 100190, Peoples R China.
Recommended Citation
GB/T 7714
Ma, Yonghui,Shen, Chao,Angelopoulos, V.,et al. Tailward leap of multiple expansions of the plasma sheet during a moderately intense substorm: THEMIS observations[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2012,117:A07219.
APA Ma, Yonghui.,Shen, Chao.,Angelopoulos, V..,Lui, A. T. Y..,Li, Xinlin.,...&Ma, YH .(2012).Tailward leap of multiple expansions of the plasma sheet during a moderately intense substorm: THEMIS observations.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,117,A07219.
MLA Ma, Yonghui,et al."Tailward leap of multiple expansions of the plasma sheet during a moderately intense substorm: THEMIS observations".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 117(2012):A07219.
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