GEM: The Role of Magnetosheath Pressure Balance in Magnetosphere-Ionosphere Coupling and Alfven Wing Formation

GEM：磁鞘压力平衡在磁层-电离层耦合和阿尔文翼形成中的作用

• 批准号: 1303649
• 负责人: Frederick Wilder
• 金额: $ 23.34万
• 依托单位: University of Colorado at Boulder
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1303649&HistoricalAwards=false
• 关键词: GEM; Role; Magnetosheath; Pressure; Balance

This proposal will investigate the role of solar wind (magnetosheath) plasma under low-beta and sub-nominal solar wind Alfvén Mach number (3) conditions. The magnetosphere under these conditions is frequently called an Alfvén Wing magnetosphere. The research will use the Coupled Magnetosphere-Ionosphere-Thermosphere (CMIT) model which includes the Lyon-Fedder-Mobarry (LFM) MHD model coupled with the Thermosphere-Ionosphere-Electrodynamics General Circulation Model (TIE_GCM) along with solar wind (OMNI), magnetosheath (Cluster and Geotail) and ionospheric (AMPERE and SuperDARN) data to investigate the effects of solar wind pressure, ionospheric conductivity and dipolar tilt on the transport of open magnetic flux and field aligned current generation in the polar cap. By examining the data and carrying out simulations for this newly discovered state of the magnetosphere they will determine how the configuration and dynamics of the lobes are controlled by Mach number and plasma beta, how the beta and Mach number control field aligned currents and flow and how important the dipole tilt is for the polar cap configuration and dynamics. This proposal will support a young scientist. It has relevance to space weather.

该提案将研究太阳风（磁鞘）等离子体在低β和亚标称太阳风阿尔文马赫数（3）条件下的作用。在这种情况下的磁层通常被称为阿尔文翼磁层。 本研究将使用耦合磁层-电离层-热层（CMIT）模式，其中包括Lyon-Fedder-Mobarry（LFM）MHD模式与热层-电离层-电动力学大气环流模式（TIE_GCM）耦合，沿着有太阳风（OMNI）、磁鞘（星团和地尾）和电离层（AMPERE和SuperDARN）数据来研究太阳风压的影响，电离层电导率和偶极倾斜对极冠中开放磁通量和场向电流产生的传输的影响。通过检查数据并对磁层的这种新发现的状态进行模拟，他们将确定叶的配置和动力学如何受马赫数和等离子体β的控制，β和马赫数如何控制场对齐电流和流动以及偶极子倾斜对极帽配置和动力学的重要性。这项提案将资助一位年轻的科学家。 它与空间天气有关。