GEM: Investigation of Plasmasphere-Magnetosphere Dynamics

GEM：等离子体层-磁层动力学的研究

基本信息

批准号：
1246006
负责人：
Joseph Borovsky
金额：
$ 20.01万
依托单位：
SPACE SCIENCE INSTITUTE
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2012
资助国家：
美国
起止时间：
2012-10-01 至 2014-09-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1246006&HistoricalAwards=false
关键词：
GEM Investigation Plasmasphere Magnetosphere Dynamics

项目摘要

This is a continuation of a study based on the GEM program in 2009 where its research was originally funded for three years. This covers that last two years of that effort. The only change is the location at which the research will be carried out. The effort had two parts. One is to carry out a scientific investigation and the second is to aid in running the scientific parts of the GEM program. Both tasks are discussed below.The plasmasphere is a region of relatively dense cold plasma (1000 cm-3) found near the Earth (~ 4 RE). This is proposal to use data analysis and simulation to investigate drainage of this cold plasma from the plasmasphere and its effect on the dynamics of the magnetosphere. Recent findings indicate that leakage of plasma from the plasmasphere may affect magnetospheric dynamics during disturbed times. This research will focus on four of the effects that have been suggested during magnetic storms. In particular the following questions will be examined: 1) Does the cold plasma affect the reconnection rate at the dayside magnetosphere? 2) Does this reduce the overall solar-wind/magnetosphere coupling? 3) Does the cold plasma influence the decay of electron radiation belts? 4) Does it lead to radiation belt dropouts and sudden recoveries? Answers to these questions should lead to a deeper understanding of the effects of cold plasma in the magnetosphere. This research will impact future global models to magnetospheric dynamics. The GEM program's research protocol is to concentrate on specific focus topics. Each of these lasts three years. Part of the funding for this research will be used to help coordinate two of these focus group efforts. These are the focus group on 'Plasmasphere-Magnetosphere Interactions' and the group on 'Diffuse Auroral Precipitation'.

这是一项基于2009年GEM计划的研究的延续，其研究最初是为期三年的。这涵盖了持续两年的努力。唯一的变化是将进行研究的位置。努力有两个部分。一种是进行科学研究，其次是帮助运行宝石计划的科学部分。下面讨论了这两个任务。等离子体是一个相对密集的冷等离子体（1000 cm-3）的区域（〜4 re）。这是使用数据分析和仿真来研究该冷等离子体从等离子石中的排水及其对磁层动力学的影响。最近的发现表明，血浆中的血浆泄漏可能会影响受干扰时间的磁层动力学。这项研究将集中在磁风暴期间提出的四种效果上。特别是将检查以下问题：1）冷等离子体会影响日期磁层时的重新连接率吗？ 2）这是否减少了整体太阳能/磁层耦合？ 3）冷等离子体会影响电子辐射带的衰变吗？ 4）这是否导致辐射带辍学和突然恢复？这些问题的答案应导致对磁层中冷等离子体的影响有更深入的了解。这项研究将影响未来的全球模型对磁层动力学。 GEM计划的研究方案是专注于特定的重点主题。这些中的每一个持续三年。这项研究的一部分资金将用于协调这些焦点小组的两个努力。这些是对“等离子体 - 磁层相互作用”的焦点组和“弥漫性极光沉淀”的群体。