Earthward flowing plasmoid: Structure and its related ionospheric signature
Earthward flowing plasmoid: Structure and its related ionospheric signature
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DOI：
10.1029/2006ja012112
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发表时间：
2007-07
影响因子：
--
通讯作者：
Q. Zong;S. Fu;D. Baker;M. Goldstein;P. Song;J. Slavin;T. Fritz;Jinbin Cao;O. Amm;H. Frey-H.
中科院分区：
文献类型：
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作者：
Q. Zong;S. Fu;D. Baker;M. Goldstein;P. Song;J. Slavin;T. Fritz;Jinbin Cao;O. Amm;H. Frey-H.
[1]2002年10月28日，星团航天器观测到一个向地球移动的等离子体团，同时IMAGE卫星观测到极光。这提供了一个机会，以确定在电离层的向地移动等离子体团的光学和演化签名。本文中观察到的电离层特征与亚暴无关。地面测量和IMAGE卫星极光观测都表明，当Cluster航天器观测到向地球移动的等离子体团时，电离层特征向低纬度移动。发现等离子体团中心的电流强度比邻近区域的电流强度弱。此外，在等离子体团的中心部分的电流的方向，从背景的交叉尾电流不同，更场对齐。这些事实是一致的尾电流关闭通过亚暴状电流楔，因为交叉尾电流被等离子体团阻挡。另一方面，向地等离子体团中的电流可能通过半球间闭合。在本文中，我们证明了磁结构，等离子体团和通量绳，将运输通量和能量从遥远的尾巴到地球。
[1] An earthward moving plasmoid has been observed on 28 October 2002 by the Cluster spacecraft with simultaneous auroral viewing by the IMAGE satellite. This offers the opportunity to ascertain the optical and the evolutional signatures in the ionosphere of the earthward moving plasmoid. The ionospheric signatures observed in this paper are not substorm-related. Both the ground-based measurements and IMAGE satellite auroral observations show the ionospheric signatures moving to lower latitudes, when the earthward moving plasmoid is observed by the Cluster spacecraft. The intensity of the current in the center of the plasmoid is found to be weaker than that in the adjacent region. Also, the directions of the current in the central part of the plasmoid, different from the background cross-tail current, are more field-aligned. Those facts are consistent with the tail current closes through the substorm-like current wedge, since the cross-tail current is blocked by the plasmoid. On the other hand, the current in the earthward plasmoid may close through the interhemisphere. In this paper we demonstrate that the magnetic structures, plasmoids and flux ropes, will transport flux and energy from the distant tail to the Earth.