SuperMAG Based Studies of External Substorm Triggering and Interhemispheric Currents

基于 SuperMAG 的外部亚暴触发和半球间电流研究

• 批准号: 1132361
• 负责人: Thomas Sotirelis
• 金额: $ 30万
• 依托单位: Johns Hopkins University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-09-01 至 2015-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1132361&HistoricalAwards=false
• 关键词: SuperMAG; Based; Studies; External; Substorm

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.

该项目将使用 NSF 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相关的许多主题。第一项任务是开发类似于 AL 和 AU 磁指数的磁指数，但该指数基于大约 100 个站点，而不是官方 AL、AU 和 AE 指数所用的 12 个站点。 然后，新指数将用于识别亚暴的爆发，其准确性比使用传统指数更高。 该项目将使用国防气象卫星计划（DMSP）的高能粒子降水数据来进一步确定亚暴爆发的位置和时间。 将使用叠加历元分析来有效地分别对每个半球中的向上磁场对齐电流进行成像。 然后，这些数据将用于研究半球间电流如何受到包括季节变化在内的各种因素的影响。该项目将产生新的磁指数，供空间物理学界使用，还将生成一个改进的亚暴爆发数据库，​​该数据库也将向公众开放。 一名暑期实习生（本科生）将参与该研究项目。