Cluster observations of earthward propagating plasmoid and flux ropes in the near-tall during the course of a substorm event

被引：9
|
作者：
Tang, C. L. [1 ]
Li, Z. Y. [1 ]
Lu, L. [2 ]
机构：
[1] Univ Sci & Technol China, Sch Earth & Space Sci, Anhua 230026, Peoples R China
[2] Chinese Acad Sci, Ctr Space Sci & Appl Res, Beijing 100080, Peoples R China
来源：
ADVANCES IN SPACE RESEARCH | 2009年 / 43卷 / 09期
基金：
中国国家自然科学基金;
关键词：
Plasmoid; Flux rope; Magnetospheric substorm; Near-tail regions; Cluster observations; MAGNETIC-FIELD; GEOTAIL OBSERVATIONS; MAGNETOTAIL; SHEET; EJECTION; TAIL; EVOLUTION; BURSTS; MODEL;
D O I：
10.1016/j.asr.2008.12.018
中图分类号：
V [航空、航天];
学科分类号：
08 ; 0825 ;
摘要：
We analyze the magnetic structures in the near-tail at XGSM = -17.5 RE on September 19, 2003 by Cluster. During the course of a substorm event, the earthward propagating plasmoid and flux ropes in the near-tail are observed. The earthward propagating plasmoid is associated with the bipolar Bz and By signatures. The two flux ropes are embedded within the earthward plasma flows, which might be referred to the population as "BBF-type" flux ropes. The first flux rope diameter is about 0.7 RE and duration based upon the Bz signature is similar to 20 s, while the second one diameter is about 1.4 RE and duration is similar to 30 s. The earthward propagating plasmoid and flux ropes could have influence upon the dipolarization and injection in inner magnetosphere. The Cluster observations of earthward propagating plasmoids on flux ropes are formed repeatedly and ejected tailward in the course of geomagnetically active time. (C) 2009 COSPAR. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：1337 / 1342
页数：6
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