Formation of intense nose structures
Formation of intense nose structures
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DOI：
10.1029/2000gl011955
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发表时间：
2001-02
影响因子：
5.2
通讯作者：
N. Ganushkina;T. Pulkkinen;V. Bashkirov;D. Baker;Xinlin Li
中科院分区：
文献类型：
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作者：
N. Ganushkina;T. Pulkkinen;V. Bashkirov;D. Baker;Xinlin Li
我们研究了1997年11月3日发生的一个观测良好的事件，当时通过极地和球间极光探测器在随后的三次内磁层穿越中观测到亚暴活动期间强烈鼻状结构的清晰特征。在固定电场（Volland‐Stern）和磁场（T96）模型中对粒子的数值跟踪表明，在这种情况下，强鼻状结构的向内位移不能仅由时间固定电场中的对流形成。我们在追踪过程中加入时变电场和磁场，它们向地球传播，代表了亚暴开始时的双极化过程。这些结果表明，粒子可以在几十分钟内移动到磁层内部，这与观测结果一致。
We examine one well‐observed event on November 3, 1997, when clear signatures of intense nose structures were observed during substorm activity on three subsequent inner magnetosphere crossings by Polar and Interball Auroral probe. Tracing particles numerically in stationary electric (Volland‐Stern) and magnetic (T96) field models shows that the inward displacement of the intense nose structure in this case could not be formed only by convection in a time‐stationary electric field. We add time varying electric and magnetic fields to the tracing procedure which propagate toward the Earth and represent the dipolarization process at a substorm onset. These results show that particles could be moved into the inner magnetosphere within some tens of minutes, consistent with the observations.