Substorm Intensity and Pre-onset Near-Earth Tail Configurations

研究人员将通过统计研究作为亚暴强度函数的预发磁结构来研究近地亚暴过程。亚暴是最具动力的磁层现象，了解它的能量学是磁层物理学中的一个突出问题。这项研究将利用相关的地面磁力仪数据和卫星测量数据。亚暴强度将通过中纬度地面磁强计中磁扰动的幅度来测量。亚暴开始前磁尾的伸展将通过比较观测和磁场模型来评估。该项目将对爆发前的尾磁结构及其与后续亚暴强度的关系进行统计研究。通过研究局部双极爆发的时间延迟，研究人员将研究尾流扰动的空间发展及其对亚暴强度的依赖。该项目还将提供有关根据近地磁场观测预测亚暴强度的能力的有用信息。

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.