Entry of plasma sheet particles into the inner magnetosphere as observed by Polar/CAMMICE
Entry of plasma sheet particles into the inner magnetosphere as observed by Polar/CAMMICE
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DOI：
10.1029/2000ja900062
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发表时间：
2000-11
期刊：
影响因子：
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通讯作者：
N. Ganushkina;T. Pulkkinen;V. Sergeev;M. Kubyshkina;D. Baker;N. Turner;M. Grande;B. Kellett;J. Fennell;J. Roeder;J. Sauvaud;T. Fritz
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文献类型：
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作者：
N. Ganushkina;T. Pulkkinen;V. Sergeev;M. Kubyshkina;D. Baker;N. Turner;M. Grande;B. Kellett;J. Fennell;J. Roeder;J. Sauvaud;T. Fritz
统计结果提出从极地/CAMMICE测量的事件，在此期间，等离子体片离子已经深入到内磁层。由于它们在能量-时间谱图中的特征结构，这些事件被称为“强鼻事件”。1997年期间对这种结构进行了近400次观测。强烈的鼻子事件被证明是更频繁的黄昏比在黎明部门。它们通常在L = 4内渗透得很好，最深的渗透发生在午夜和中午左右。强烈的鼻事件与磁（亚暴）活动有关。然而，即使是中等活性（AE = 150-250 nT）也导致这些结构的形成。在1997年11月3日的案例研究中，显示了极地和Interball Auroral航天器的三个连续的内磁层穿越，每个都表现出强烈的鼻状结构的特征。使用这些观测的最内层边界确定，证明了大尺度对流电场本身不能解释结构的向内运动。这表明，强烈的鼻状结构是由L=4-5时内尾中的短寿命强电场（超过1 mV/m）引起的。
Statistical results are presented from Polar/CAMMICE measurements of events during which the plasma sheet ions have penetrated deeply into the inner magnetosphere. Owing to their characteristic structure in energy‐time spectrograms, these events are called “intense nose events.” Almost 400 observations of such structures were made during 1997. Intense nose events are shown to be more frequent in the dusk than in the dawn sector. They typically penetrate well inside L = 4, the deepest penetration having occurred around midnight and noon. The intense nose events are associated with magnetic (substorm) activity. However, even moderate activity (AE = 150–250 nT) resulted in formation of these structures. In a case study of November 3, 1997, three sequential inner magnetosphere crossings of the Polar and Interball Auroral spacecraft are shown, each of which exhibited signatures of intense nose‐like structures. Using the innermost boundary determinations from these observations, it is demonstrated that a large‐scale convective electric field alone cannot account for the inward motion of the structure. It is suggested that the intense nose structures are caused by short‐lived intense electric fields (in excess of ∼1 mV/m) in the inner tail at L=4–5.