Hot Plasma in the Magnetotail Lobes Shows Characteristics Consistent With Closed Field Lines Trapped in the Lobes
Hot Plasma in the Magnetotail Lobes Shows Characteristics Consistent With Closed Field Lines Trapped in the Lobes
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DOI：
10.1029/2021ja029516
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发表时间：
2021-08
期刊：
影响因子：
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通讯作者：
J. Coxon;R. Fear;J. Reidy;L. J. Fryer;James Plank
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文献类型：
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作者：
J. Coxon;R. Fear;J. Reidy;L. J. Fryer;James Plank
我们使用2001-2009年来自星系团1上的热离子分析仪的数据来检查磁尾。我们开发和利用了一种算法，以便识别星系团1在磁尾叶中但观察到等离子体的时间，这比我们对磁尾叶的预期更热。我们分析了我们的算法和一个参考算法(没有粒子能量准则)的主流行星际磁场BZ条件，发现我们选择的周期平均向北偏北的∼为2nT。研究我们周期的磁尾温度表明，平均温度的形态与米兰等人的一致。(2005)的磁尾结构的https://doi.org/10.1029/2004JA010835)模型，其中封闭的场线被阻止对流到日侧，使它们和被捕获的等离子体突出到磁尾叶中。我们还发现有证据表明，我们所识别的周期中有0.5%的∼可能是由太阳风直接进入磁层驱动的。
We examine the magnetotail using data from the Hot Ion Analyzer on Cluster 1 during 2001–2009. We develop and utilize an algorithm in order to identify times during which Cluster 1 is in the magnetotail lobe but observes plasma, which is hotter than our expectations of the lobe. We analyze the prevailing Interplanetary Magnetic Field (IMF) BZ conditions for our algorithm and a reference algorithm (with no particle energy criteria) and find that the periods we select are, on average, ∼2 nT more toward northward IMF. Examining the temperature in the magnetotail for our periods shows that the morphology of the average temperature is consistent with the Milan et al. (2005, https://doi.org/10.1029/2004JA010835) model of a magnetotail structure during northward IMF, in which closed field lines are prevented from convecting to the dayside, causing them and the plasma trapped on them to protrude into the magnetotail lobes. We also find evidence that ∼0.5% of our identified periods may be driven by direct entry into the magnetosphere from the solar wind.