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Substorm: view from global MHD simulation and THEMIS observation

机译：亚风暴：来自全球MHD模拟和THEMIS观测的视图

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摘要

In the geospace, a disturbance phenomenon called "substorm" are frequently observed, which can cause a great impact on elements in the humanosphere, such as radiation damage and surface charging on the satellite, health risk to astronauts due to the high-latitude radiation environment, and disasters in power transmission networks. To understand the physics of the substorm should be of prime importance, which helps us (1) to avoid such disasters by forecasting, and (2) to be a breakthrough in systematic understanding of the near-Earth environment from a global perspective, because the substorm is a global phenomenon whose signatures can be traced in most regions of the geospace. Triggering mechanism of the substorm expansion onset is one of the mostimportant issues in the substorm research, which has not yet been exactly settled, though a number of models have been advocated previously. In this paper, I will firstly review the observational discovery of the magnetosphere that is the arena of the substorm phenomena, and then make a review on the triggering mechanism of the substorm onset, finally from a viewpoint of comparison between a global MHD simulation and multiple satellites observation the triggering mechanism will be reconsidered by the formation and evolution of high-pressure region origin from the magnetic reconnection site in the middle magnetotail.
机译：在地球空间中，经常观察到一种称为“亚暴”的扰动现象，它会对人为圈中的元素造成巨大影响，例如辐射损伤和卫星表面电荷，以及高纬度辐射环境对宇航员的健康造成的危害，以及输电网络中的灾难。理解亚风暴的物理特性至关重要，这有助于我们（1）通过预测避免此类灾害，以及（2）从全球角度对系统进行近地环境的理解方面取得突破，因为亚风暴是一种全球性现象，其特征可以在地理空间的大多数区域中找到。亚暴扩展爆发的触发机制是亚暴研究中最重要的问题之一，尽管之前已经提出了许多模型，但尚未完全解决。在本文中，我将首先回顾作为亚暴现象舞台的磁层的观测发现，然后对亚暴爆发的触发机制进行回顾，最后从全局MHD模拟与多次MHD模拟的比较角度进行回顾。卫星的观测触发机制将由中磁尾磁重合部位高压区的形成和演化来重新考虑。

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