GEM Postdoc: Development of a Substorm-time Magnetic Field Model Based on Computer Experiments and Investigation of Related Ionosphere-Magnetosphere Dynamics

这个项目将开发一个新的磁场模型，目的是在磁层亚暴期间使用。该模型将基于赖斯对流模型（RCM-E）的平衡版本进行一系列计算机实验。该项目将为亚风暴生长阶段构建一个交叉尾电流模块，为扩展阶段构建一个亚风暴电流楔模块。该项目还将利用全套RCM-E模拟作为一个大型数据库，系统地研究亚暴生长阶段等离子体的绝热对流和膨胀阶段耗尽通量管的输运。所使用的方法是生成大量具有系统不同输入的RCM-E模拟。这将使确定边界条件和初始条件的不同变化如何影响内磁层中的磁场结构成为可能。这种方法也将使建立不同物理过程和结果之间的因果关系成为可能。新模型将提供给空间物理社区，在那里它可以用来指定各种亚暴条件下的磁场结构。该项目将使几个焦点小组受益，这些小组是地球空间环境建模计划的一部分。该模型也有望在理解和改进空间天气预报方面发挥作用。

This project will develop a new magnetic field model aimed for use during magnetospheric substorms. The model will be derived from a series of computer experiments based on the equilibrium version of the Rice Convection Model (RCM-E). The project will construct a cross-tail current module for the substorm growth phase and a substorm current-wedge module for the expansion. The project will also use the comprehensive set of RCM-E simulations as a large database to systematically investigate the adiabatic convection of the plasma during substorm growth phase and the transport of the depleted flux tubes in the expansion phase.The methodology to be used is to generate a large number of RCM-E simulations with systematically varied inputs. This will make it possible to determine how different changes in the boundary conditions and the initial condition affect the magnetic field configuration in the inner magnetosphere. This approach will also make it possible to establish the cause-and-effect relationships between different physical processes and consequences. The new model will be made available to the space physics community where it can be used to specify the magnetic field configuration for a variety of substorm conditions. The project will benefit several of the Focus Groups that are part of the Geospace Environment Modeling program. The model is expected to be of utility in understanding and improving space weather forecasts as well.