Simultaneous THEMIS in situ and auroral observations of a small substorm
Simultaneous THEMIS in situ and auroral observations of a small substorm
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DOI：
10.1029/2008gl033794
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发表时间：
2008-08-12
影响因子：
5.2
通讯作者：
Rae, I. J.
中科院分区：
文献类型：
--
作者：
Donovan, E.;Liu, W.;Rae, I. J.
我们提供 2007 年 3 月 13 日以来的地面和现场观测结果。THEMIS 卫星位于晚间区域，与 THEMIS 地面成像仪共轭。与 0507 UT 类似，在内 CPS 场线上也有光学起始点。这涉及起始弧的 1 MLT 小时纵向段几乎同时变亮。弧线变亮的部分最接近漫射（质子）极光的赤道边界。一分钟之内，极化锋面穿过四颗 THEMIS 卫星。根据它们的位置、它们检测到偶极锋的顺序以及极光演化，我们断言膨胀阶段从四颗卫星向地球开始并径向向外演化。我们得出的结论是，这种爆发发生在高度拉伸的磁力线的方位局部区域中。
We present ground-based and in situ observations from March 13, 2007. The THEMIS satellites were in the evening sector conjugate to THEMIS ground-based imagers. At similar to 0507 UT there was an optical onset on inner CPS field lines. This involved near-simultaneous brightening of 1 MLT hour longitudinal segment of the onset arc. The part of the arc that brightened was that closest to the equatorward boundary of the diffuse ( proton) aurora. Within one minute, a dipolarization front moved across four THEMIS satellites. Based on their locations, the order in which they detected the dipolarization front, and the auroral evolution, we assert that the expansion phase began earthward of the four satellites and evolved radially outwards. We conclude that this onset occurred in an azimuthally localized region of highly stretched field lines.