Two-satellite observations of substorm injections at geosynchronous orbit
Two-satellite observations of substorm injections at geosynchronous orbit
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DOI：
10.1029/2000ja000080
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发表时间：
2001-05
影响因子：
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通讯作者：
M. Thomsen;J. Birn;J. Borovsky;K. Morzinski;D. McComas;G. Reeves
中科院分区：
文献类型：
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作者：
M. Thomsen;J. Birn;J. Borovsky;K. Morzinski;D. McComas;G. Reeves
来自三颗间隔相当近的地球同步卫星的高能粒子和等离子体测量用于检查空间分离位置处亚暴粒子注入的同时行为。总共 43 个注入事件被确定为两颗或更多卫星上的无色散事件。观测结果证实，离子和电子注入区域在方位角方向上存在空间偏移，正如之前从单卫星观测中统计得出的那样，以及地磁尾重连的 MHD 模拟中的测试粒子轨迹所揭示的那样。两艘航天器的观测进一步表明，离子和电子的注入区域在几分钟的时间尺度内向东和向西方向均方位角扩展。观察到的膨胀率与测试粒子/MHD 模拟得出的膨胀率相当，进一步支持将这种重新连接确定为亚暴粒子注入的最终原因。
Energetic particle and plasma measurements from three fairly closely spaced geosynchronous satellites are used to examine the simultaneous behavior of substorm particle injections at spatially separated locations. A total of 43 injection events are identified as dispersionless at two or more satellites. The observations confirm that the ion and electron injection regions are spatially offset in the azimuthal direction, as previously deduced statistically from single-satellite observations and revealed by test-particle trajectories in MHD simulations of geomagnetic tail reconnection. The two-spacecraft observations show further that the injection regions for both ions and electrons expand azimuthally in both the eastward and westward directions over a timescale of several minutes. The observed expansion rates are comparable to expansion rates derived from the test particle/MHD simulations, lending further support to the identification of such reconnection as the ultimate cause of substorm particle injections.