Multi-Satellite Magnetospheric Studies

将对多航天器和互补的地面观测进行分析，以了解磁层亚暴现象和风暴时的环电流离子。将与亚暴扩展阶段发展的等离子体不稳定性的理论结果进行比较。数据分析将包括：(1)确定近地磁尾中的亚暴增长阶段特征；(2)将极光现象的空间发展与磁层中亚暴信号的黎明-黄昏和径向延伸联系起来；(3)比较尾部高能粒子爆发的发生与亚暴增强的关系，以及(4)评估磁层中环电流离子风暴时间输运的性质。交叉场电流不稳定性将被进一步研究，包括考虑密度梯度或曲率漂移引起的平衡电流，多离子组成的影响，以及它从中性片到等离子体片高纬度部分的扩展。由此产生的理论预测将与多航天器研究获得的结果进行比较。

Multi-spacecraft and complementary ground-based observations will be analyzed to understand magnetospheric substorm phenomena and storm-time ring current ions. Comparisons will be made with theoretical results of plasma instabilities developed for the substorm expansion phase. Data analysis will consist of (1) determining the substorm growth phase features in the near-earth magnetotail, (2) relating the spatial development of auroral phenomena to the dawn-dusk and radial extension of substorm signatures in the magnetosphere, (3) comparing the occurrences of energetic particle bursts in the tail with substorm intensifications, and (4) assessing the nature of storm-time transport of ring current ions in the magnetosphere. The cross- field current instabilities will be studied further including consideration of equilibrium current arising from density gradient or curvature drift, the effect of multi-ion composition, and its extension from the neutral sheet to the higher latitude portion of the plasma sheet. The resulting theoretical predictions will be compared with findings obtained from the multi-spacecraft study.