GEM: Global Modeling of the Consequences of High-latitude Merging Processes at the Magnetopause

GEM：磁层顶高纬度合并过程后果的全球建模

• 批准号: 0603222
• 负责人: Jean Berchem
• 金额: --
• 依托单位: University of California-Los Angeles
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-05-15 至 2009-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0603222&HistoricalAwards=false
• 关键词: GEM; Global; Modeling; Consequences; latitude

This project will investigate the large-scale properties and consequences of magnetic merging processes (reconnection) at the high-latitude dayside magnetopause. It will examine the contribution of high-latitude reconnection to the transport of mass, energy, and momentum from the solar wind to the magnetosphere. In particular, the investigation will focus on determining the role played by magnetic reconnection in the maintenance and the occasional thickening of the low latitude boundary layer (LLBL), as well as its role in providing plasma to the magnetotail plasma sheet during periods of northward interplanetary magnetic field (IMF). Magnetohydrodynamic (MHD) simulations and large-scale kinetic (LSK) calculations will be employed to follow fields and particles from the solar wind to the plasma sheet. Both in-situ measurements and ground observations will be used to initialize and validate the MHD and LSK simulations. Although the investigation will primarily focus on periods in which the shocked IMF reconnects with the geomagnetic field at high latitudes, cases of reconnection occurring at lower latitudes will also be investigated. A series of specific simulation studies based on the coordinated analysis of observations from the ACE, CLUSTER, GEOTAIL, POLAR, and WIND spacecraft, as well as ground-based data from the Super Dual Auroral Radar Network (SuperDARN) international network of high-frequency radars, have been identified for use in the investigation. The subjects of these studies include the large-scale structure and dynamics of the high-latitude dayside magnetosphere, the connectivity of the high-latitude region with the rest of the magnetosphere, and the large-scale kinetic processes involved in the structure and dynamics of the high-latitude region as well as the formation of the LLBL and the transport of solar wind plasma to the plasma sheet. The investigation will represent a significant contribution to the ultimate objective of the Geospace Environment Modeling program's Global Interaction (GI) campaign.

该项目将调查高纬度昼侧磁层顶磁合并过程（重连）的大尺度特性和后果。它将研究高纬度重联对从太阳风到磁层的质量、能量和动量传输的贡献。特别是，调查将集中在确定所发挥的作用磁重联在维护和偶尔增厚的低纬度边界层（LLBL），以及其在向北行星际磁场（IMF）期间提供等离子体的磁尾等离子体片的作用。磁流体动力学（MHD）模拟和大尺度动力学（LSK）计算将被用来跟踪从太阳风到等离子体片的场和粒子。现场测量和地面观测将用于初始化和验证MHD和LSK模拟。虽然调查将主要集中在受冲击的IMF与高纬度地磁场重新连接的时期，但也将调查在低纬度发生的重新连接的情况。在对ACE、CLUSTER、GEOTAIL、POLAR和WIND航天器的观测数据以及超级双极光雷达网国际高频雷达网的地面数据进行协调分析的基础上，确定了一系列具体的模拟研究可用于调查。这些研究的主题包括高纬度昼侧磁层的大尺度结构和动力学，高纬度地区与磁层其余部分的连通性，高纬度地区的结构和动力学所涉及的大尺度动力学过程，以及LLBL的形成和太阳风等离子体向等离子体片的输送。这项研究将为地球空间环境建模计划的全球互动（GI）活动的最终目标做出重大贡献。