SuperMAG Based Studies of External Substorm Triggering and Interhemispheric Currents

该项目将使用美国国家科学基金会支持的SuperMAG数据中心的数据来解决与磁层亚暴和亚暴期间产生的电流有关的一些主题。第一项任务是制定与AL和AU磁性指数类似的磁性指数，但其依据是大约100个台站，而不是用于官方AL、AU和AE指数的12个台站。然后，新的指数将被用来比使用传统指数更准确地识别亚风暴的发生。该项目将使用来自国防气象卫星计划(DMSP)的高能粒子降水数据，以进一步确定亚暴开始的位置和时间。叠加的历元分析将被用来有效地分别成像每个半球的向上磁场排列的电流。然后，这些数据将被用来研究包括季节变化在内的各种因素对半球间电流的影响。该项目将产生新的磁指数，将向空间物理界提供，还将产生一个改进的亚风暴开始时间数据库，该数据库也将公开。一名暑期实习生(本科生)将参与研究项目。

This project will use data from the NSF-supported SuperMAG data center to address a number of topics related to magnetospheric substorms and the electric currents that are generated during substorms. The first task will be to develop magnetic indices that are similar to the AL and AU magnetic indices but that are based on approximately 100 stations rather than on the 12 stations used for the official AL, AU and AE indices. The new indices will then be used to identify the onset of substorms with greater accuracy than can be done using the traditional indices. The project will use energetic particle precipitation data from the Defense Meteorological Satellite Program (DMSP) to further refine that location and time of substorm onsets. A superposed epoch analysis will be used to effectively image the upward magnetic-field-aligned currents separately in each hemisphere. These data will then be used to examine how the interhemispheric current is affected by a variety of factors including the seasonal variations.The project will produce new magnetic indices that will be made available to the space physics community and will also generate an improved database of substorm onsets that will also be made publicly available. A summer intern (undergraduate student) will be involved in the research project.