GEM: A Combined Simulation Model for the Magnetosphere: Global MHD Meets the Rice Convection Model

目标是通过合并两个现有模型来开发一个新的大规模地球磁层动力学计算模型：(i)最初由海军研究实验室开发的全球3d MHD代码，以及（ii） Rice对流模型（RCM）。合并后的代码将保留MHD代码的自一致性和全面性，并将包括弓形激波、磁鞘、太阳风/磁层相互作用以及远尾。但合并后的代码也将利用赖斯对流模型的精细网格，多流体表示内部磁层和近地等离子体片。此外，通过使用MHD模型提供的自洽时相关磁场，RCM对磁层内部的表示将得到实质性改进。两个代码的合并将分三个阶段完成，每一步都有仔细的测试和分析。在每个阶段，代码将用于模拟特定的、观测良好的磁层事件，并将模拟结果与GEM活动中获得的观测结果进行测试。

The objective is to develop a new computational model of the large- scale dynamics of the Earth's magnetosphere by merging two existing models: (i) the global 3d MHD code that was orginially developed at the Naval Research Laboratory, and (ii) the Rice Convection Model (RCM). The merged code will retain the self-consistency and comprehensiveness of the MHD code and will include the bow shock, magnetosheath, solar-wind/magnetosphere interactions, as well as the distant tail. But the merged code will also utilize the Rice Convection Model's finely gridded, many-fluid representation of the inner magnetosphere and near-Earth plasma sheet. In addition, the RCM's representation of the magnetospheric interior will be substanitally improved through the use of the self-consistent time- dependent magnetic field supplied by the MHD model. Merger of the two codes will be accomplished in three phases, with careful testing and analysis at each step. In each phase, the code will be used to simulate specific, well-observed magnetospheric events, and simulation results will be tested against observations obtained in GEM campaigns.