ISEE 3 plasmoid and TCR observations during an extended interval of substorm activity
ISEE 3 plasmoid and TCR observations during an extended interval of substorm activity
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亚暴活动延长期间的 ISEE 3 等离子体团和 TCR 观测
DOI：
10.1029/92gl00394
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发表时间：
1992
影响因子：
5.2
通讯作者：
E. Greenstadt
中科院分区：
文献类型：
--
作者：
J. Slavin;M. Smith;E. Mazur;D. Baker;T. Iyemori;H. Singer;E. Greenstadt
1983年4月9日至11日，ISEE 3号航天器在X=-76至-80R(E)的下游距离连续定位在地球磁尾内超过36小时。在这段时间内，在AL指数中观察到了12个主要的亚暴活动时段，其中11个时段的ISEE 3遥测覆盖良好。此外，在这些间隔之外还有两个小的亚暴，都是在遥远的尾巴上进行了完整的观测。这一不同寻常的ISEE 3数据集为检验近地中性线模型的预测提供了一个独特的机会。特别是，检验了这样的假设，即在生长阶段存储在尾叶中的能量后来被部分地通过在膨胀阶段开始后释放一个或多个等离子体来耗散。在九个亚暴开始之前，叶部磁场强度的明显增长阶段增强。在ISEE 3观测到的等离子体团或其叶特征移动压缩区域(TCR)与所有11个有ISEE观测的主要亚暴间隔以及两个小亚暴有关。在没有亚暴活动的情况下，没有观察到等离子体或TCR。如果这些ISEE 3的观测结果具有代表性，那么沿尾部释放等离子体团可能是所有亚暴的共同特征。
On April 9-11, 1983, the ISEE 3 spacecraft was continuously located within the earth's magnetotail for more than 36 hours at downstream distances of X = -76 to -80 R(e). During this span of time, 12 major intervals of substorm activity were observed in the AL index with good ISEE 3 telemetry coverage for 11 of them. In addition, there were two small substorms outside of these intervals, both with complete observations in the distant tail. This unusual ISEE 3 data set provides a unique opportunity to test the predictions of the near-earth neutral line model. In particular, the hypothesis that energy stored in the tail lobes during the growth phase is later dissipated, in part, through the release of one or more plasmoids following expansion phase onset is examined. Clear growth phase enhancements in the lobe magnetic field intensity preceded the onsets of nine of the substorms. Plasmoids, or their lobe signatures, traveling compression regions (TCRs), were observed at ISEE 3 in association with all 11 of the major substorm intervals for which there were ISEE observations, as well as for the two small substorms. No plasmoids or TCRs were observed in the absence of substorm activity. If these ISEE 3 observations are representative, then the release of plasmoids down the tail may be a feature common to all substorms.