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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Thermodynamics of the Magnetotail Current Sheet Thinning
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Thermodynamics of the Magnetotail Current Sheet Thinning

机译：热力学的磁尾电流片变薄

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摘要

Substorm growth phase in the magnetotail is characterized by formation of a thin current sheet (CS) becomes unstable due to external or internal drivers. Such instability results in magnetic field line reconnection, the substorm onset. The CS thinning, as a key process of substorm dynamics, has been included into many global and local simulations of the magnetotail magnetic reconnection. However,recent observations indicate that the evolution of plasma characteristics and magnetic field configuration during the CS thinning can differ from predictions of the classical adiabatic scenario. In this study, we combine two most extensive datasets of the CS evolution, as observed by Cluster and THEMIS missions for 2001-2009 and 2015, respectively. We show that for a wide range of downtail distances and dawndusk direction there are quite similar quantitative characteristics of the thinning: the magnetic field line stretching (north-south magnetic field decrease), the intensification of the current density, and the evolution of plasma temperatures and densities. We confirm that the process cannot be directly associated with increase of the lobe magnetic pressure. Using advantages of multispacecraft measurements and CS flapping motion, we demonstrate that the thinning is usually result in the equatorial density increase and plasma temperature decrease. We discuss the revealed evolution features in the context of the thermodynamical CS characteristics for contemporary thinning models.
机译：在磁尾亚暴增长阶段特点是薄电流的形成表(CS)由于外部或变得不稳定内部驱动程序。磁场线重新连接,亚暴发病。亚暴动力学,包括成许多全球和本地模拟磁尾磁重联。观测表明,进化的等离子体特性和磁场配置在CS稀释可以不同从古典绝热的预测场景。大规模数据集的CS进化,忒弥斯观察到集群和任务2001 - 2009年和2015年,分别。广泛的downtail距离和dawndusk方向非常相似变薄的定量特征:磁场线拉伸(南北磁场减少),强化电流密度和等离子体的演化温度和密度。过程不能直接相关叶磁压力的增加。multispacecraft测量和CS的优点拍打动作,我们表明,变薄通常是导致赤道密度增加和等离子体温度下降。讨论了进化的特性热力学CS的特点当代稀疏模型。

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