Tailward leap of multiple expansions of the plasma sheet during a moderately intense substorm: THEMIS observations
文献类型：期刊论文
| 作者 | 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. |
| 刊名 | JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
 |
| 出版日期 | 2012 |
| 卷号 | 117页码:A07219 |
| ISSN号 | 2169-9380 |
| 通讯作者 | Ma, YH (reprint author), Chinese Acad Sci, Ctr Space Sci & Appl Res, State Key Lab Space Weather, Beijing 100190, Peoples R China. |
| 中文摘要 | 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. |
| 英文摘要 | 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. |
| 学科主题 | 空间物理 |
| 收录类别 | SCI |
| 资助信息 | National Natural Science Foundation of China [40974101, 40921063]; Ministry of Science and Technology of China [2011CB811404]; Specialized Research Fund for State Key Laboratories of the Chinese Academy of Sciences |
| 语种 | 英语 |
| 公开日期 | 2014-12-15 |
| 源URL | [http://ir.nssc.ac.cn/handle/122/3197]  |
| 专题 | 国家空间科学中心_空间科学部 |
| 推荐引用方式 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.,...&Larson, D..(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. |
入库方式： OAI收割
来源：国家空间科学中心
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。