The electron edge of low latitude boundary layer during accelerated flow events
The electron edge of low latitude boundary layer during accelerated flow events
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DOI：
10.1029/gl017i011p01833
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发表时间：
1990-10
影响因子：
5.2
通讯作者：
J. Gosling;M. Thomsen;S. J. Bame;T. Onsager;C. Russell
中科院分区：
文献类型：
--
作者：
J. Gosling;M. Thomsen;S. J. Bame;T. Onsager;C. Russell
进入地球磁层并填充低纬边界层（LLBL）的磁鞘等离子体通常会被加速到比在邻近磁鞘中观察到的速度大得多的速度。在此类加速流事件期间进行的测量揭示了 LLBL 的电子和离子边缘是分开的，其中电子边缘位于离子边缘的地球方向。在 LLBL 的地球边缘观察到的等离子体电子速度分布通常是高度结构化的，表现出与局部磁场平行、反平行以及垂直的巨大不对称性。这些特征可以一致地解释为最近重新连接的场线的飞行时间效应，因此是支持加速等离子体流事件的重新连接解释的有力证据。
Magnetosheath plasma entering the Earth's magnetosphere to populate the low latitude boundary layer, LLBL, is often accelerated to speeds considerably greater than are observed in the adjacent magnetosheath. Measurements made during such accelerated flow events reveal separate electron and ion edges to the LLBL, with the electron edge being found earthward of the ion edge. Plasma electron velocity distributions observed at the earthward edge of the LLBL are often highly structured, exhibiting large asymmetries parallel and antiparallel, as well as perpendicular, to the local magnetic field. These features can consistently be interpreted as time-of-flight effects on recently reconnected field lines, and thus are strong evidence in support of the reconnection interpretation of accelerated plasma flow events.