GEM: The Role of Ring Current Composition in the Recovery Rate of Magnetic Storms

GEM：环流成分对磁暴恢复率的作用

• 批准号: 9801944
• 负责人: Douglas Hamilton
• 金额: $ 5.56万
• 依托单位: University of Maryland, College Park
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-07-15 至 2000-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9801944&HistoricalAwards=false
• 关键词: GEM; Role; Ring; Current; Composition

This project will use the extensive archival data set from the AMPTE/CCE satellite to investigate the way in which the composition of the ring current (specifically, H+ and O+) affects the rate of ring current decay and hence the recovery from a magnetic storm. The investigators will examine the various loss processes involved, such as charge exchange, coulomb collisions, and wave-particle interactions. Storms vary in the total energy pumped into the ring current and the H+/O+ ratio also varies. The differing cross-sections to the various loss mechanisms can therefore lead to very different magnetic storms. An understanding of the details of these processes will likely lead to a better understanding of recovery process. This can in turn lead to improvements in the models of the ring current and radiation belts that are expected to become part of the Global Geospace Circulation Model (GGCM). This is therefore an important topic for the Geospace Environment Modeling program (GEM). It also has significance to the Space Weather program.

该项目将利用AMPTE/CCE卫星提供的大量档案数据集，调查环电流的组成（具体而言，H+和O+）如何影响环电流衰减率，从而影响从磁暴中恢复的情况。 研究人员将研究所涉及的各种损失过程，如电荷交换，库仑碰撞和波粒相互作用。 风暴在注入环电流的总能量方面有所不同，H+/O+比率也有所不同。 因此，不同的损失机制的不同横截面可以导致非常不同的磁暴。 了解这些过程的细节可能会导致更好地理解恢复过程。 这反过来又会导致改进环电流和辐射带模型，这些模型预计将成为全球地球空间环流模型的一部分。 因此，这是地球空间环境建模计划（GEM）的一个重要课题。 它对空间气象计划也有重要意义。