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

这项提议将研究太阳风(磁鞘)等离子体在低贝塔和亚标称太阳风Alfvén马赫数(3)条件下的作用。在这些条件下的磁层通常被称为阿尔芬翼磁层。这项研究将利用磁层-电离层-热层耦合模型(CMIT)，其中包括Lyon-Fedder-Mobarry(LFM)MHD模型和热层-电离层-电动力学大气环流模型(Tie_GCM)以及太阳风(OMNI)、磁鞘(星团和GeoTail)和电离层(Ampere和SuperDARN)数据来研究太阳风压、电离层电导率和偶极倾斜对极帽中开放磁通量和场向电流产生的传输的影响。通过检查数据并对这种新发现的磁层状态进行模拟，他们将确定磁极叶的形状和动态如何由马赫数和等离子体β控制，贝塔和马赫数如何控制场对齐的电流和流动，以及偶极倾斜对极帽结构和动力学的重要性。这项提议将支持一位年轻的科学家。它与太空天气有关。

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.