GEM: Empirical Modeling of the Magnetosphere for GEM

将建立一个三维地球磁层的经验模型，它将提供磁场和电场以及等离子体参数的规范。这项工作涉及扩展现有的磁层三维磁场模型，方法是(1)提供与磁力平衡的等离子体分布，(2)通过绘制电离层一级的电场模式图来确定磁层中的电场模式，以及(3)现实地表示亚暴增长阶段期间的全球变化。由此产生的模型将提供磁场和电场以及等离子体参数(数密度、对流速度和温度)的全球规范，而不受空间尺度大小的任何限制。这项工作将扩大到包括亚风暴增长阶段的代表。该模型将有助于为数值(MHD、混合或全粒子)模拟提供初始设置参数值，以研究后续的动态变化。

An empirical model of the three-dimensional Earth's magnetosphere which will provide specification of magnetic and electric fields as well as plasma parameters will be constructed. This effort involves extending the existing three-dimensional magnetic field model of the magnetosphere by (1) providing plasma distribution in force equilibrium with the magnetic forces, (2) determining electric field pattern in the magnetosphere by mapping its pattern from the ionospheric level, and (3) implementing realistic representation of global changes during the substorm growth phase. The resulting model will provide a global specification of magnetic and electric fields together with plasma parameters (number density, convective flow velocity, and temperature) without any constraint on the spatial scale size. The effort will be extended to include a representation of the substorm growth phase. The model will be useful in providing initial setup parameter values for numerical (MHD, hybrid, or full particle) simulation to investigate on subsequent dynamical changes.