Substorm Intensity and Pre-onset Near-Earth Tail Configurations

研究人员将通过统计调查亚暴强度的函数来研究近地亚暴过程。亚暴是最具动态性的磁层现象，了解其能量学是磁层物理学的突出问题之一。这项研究将利用相关的地面磁力计数据和卫星测量数据。亚暴强度将通过中纬度地面磁力计的磁扰动幅度来测量。将通过与磁场模型的对比观测来评估亚暴发生前磁尾的拉伸。该项目将统计地检验开始前的尾磁结构及其与随后次暴强度的关系。通过检查局部双极化开始的时间延迟，研究人员将检查尾电流中断的空间发展及其对亚暴强度的依赖。该项目还将提供有关近地磁场观测预测亚暴强度能力的有用信息。

The investigators will study near-Earth substorm processes by statistically investigating the pre-onset magnetic configuration as a function of substorm intensity. A substorm is the most dynamic magnetospheric phenomenon, and understanding its energetics is one of the outstanding questions in magnetospheric physics. This study will make use of correlated ground magnetometer data and satellite measurements. The substorm intensity will be measured by the amplitude of magnetic perturbations in mid-latitude ground magnetometers. The stretching of the magnetotail before substorm onsets will be evaluated by comparing observations with magnetic field models. The project will statistically examine the pre-onset tail magnetic configuration and its relationship to the intensity of the subsequent substorm. By examining the time delay of a local onset of dipolarization, the investigators will examine the spatial development of tail current disruption and its dependence on substorm intensity. The project will also provide useful information about the prediction capability of substorm intensity from near-Earth magnetic field observations.