Dipolarization observed by TC1 and ClusterII during substorm in Sep. 14, 2004
文献类型：期刊论文
| 作者 | Cao Xin; Pu Zu-Yin; Zhang Hui; Fu Sui-Yan; Ma Zhi-Wei; Xiao Chi-Jie; Liu Zhen-Xing; Xie Lun; Dunlpo M. W.; Korth A. |
| 刊名 | CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
 |
| 出版日期 | 2007-07-01 |
| 卷号 | 50期号:4页码:995-1004 |
| 关键词 | dipolarization substorm near earth reconnection continues lobe reconnection Pi2 |
| 英文摘要 | We study the substorm dipolarization occurring from 1730 to 1930 UT on Sep. 14, 2004 based on DSP/TC1, Cluster and Polar data, combined with the aurora and geosynchronous energetic particle measurements and ground-based magnetic field observations. During this time period the IMF was continuously southward. Substorm onset started at about 1823 UT. Two minute later, energetic electron injection was observed by LANL-02A in the pre-midnight sector at geostationary orbit. At similar to 1827 UT TC1, which was located at (-10, -2, 0) RE (GSE) in the near-Earth tail, saw a sharp decrease of magnetic B-X component, accompanied by sudden increases in both the ion temperature and thermal pressure. About 23 minutes later at similar to 1850 UT, the same signatures as observed by TC1 were observed by Cluster at (-16, 1, 3) R-E (GSE) in the mid-tail. Meanwhile, Polar, which was located much higher and more close to the Earth at (-7.5, 3.5, - 4.0) R-E (GSE), saw a sudden change in the elevation of the magnetic field at about 1855 UT. Aforementioned time sequence of substorm activities indicates that the expansion onset took place at about 1823 UT and TC1 and Cluster observed dipolarization (tail expansion) 4 and 27 minutes later, respectively. This means that tail expansion was propagated from source region in the near-Earth tail to the mid-tail. Detailed calculations imply that the source of the dipolarization was situated at X = -7.7R(E) to -8.6R(E) and the propagation speed was about 70 km.s(-1). A substorm paradigm is proposed to explain the observations in this substorm event: Earthward flow produced by lobe reconnection in the mid-tail creates favorable conditions for substorm initiation in the near-Earth; after the expansion onset the dipolarization front propagates down to the tail. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000248343500006 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/7193]  |
| 专题 | 国家天文台_太阳物理研究部 |
| 作者单位 | 1.Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China 2.Chinese Acad Sci, Ctr Space Sci & Appl Res, Beijing 100080, Peoples R China 3.Chinese Acad Sci, Inst Plasma Phys, Hefei 230026, Peoples R China 4.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 5.Rutherford Appleton Lab, Space Sci & Technol Dept, Didcot, Oxon, England 6.Boston Univ, CSP, Boston, MA 02215 USA 7.Univ London Imperial Coll Sci Technol & Med, Blackett Lab, London SW7 2AZ, England 8.TU Braunschweig, IGM, Braunschweig, Germany |
| 推荐引用方式 GB/T 7714 | Cao Xin,Pu Zu-Yin,Zhang Hui,et al. Dipolarization observed by TC1 and ClusterII during substorm in Sep. 14, 2004[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2007,50(4):995-1004. |
| APA | Cao Xin.,Pu Zu-Yin.,Zhang Hui.,Fu Sui-Yan.,Ma Zhi-Wei.,...&Glassmeier K. H..(2007).Dipolarization observed by TC1 and ClusterII during substorm in Sep. 14, 2004.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,50(4),995-1004. |
| MLA | Cao Xin,et al."Dipolarization observed by TC1 and ClusterII during substorm in Sep. 14, 2004".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 50.4(2007):995-1004. |
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来源：国家天文台
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