GEM: Effect of Multiple Substorms on the Buildup of the Ring Current

该项目将研究磁暴期间导致地球环电流积聚的条件。它将利用戈达德航天飞行中心的社区协调建模中心（CCMC）来模拟环电流的发展。CCMC的全球磁流体动力学（MHD）模拟模型可以耦合到M. C.霍先生该项目有三个主要目标。首先是确定多个亚暴在一个风暴的环电流动力学的相对重要性。第二个目标是研究不同的太阳风条件如何影响环电流的形成。第三是模拟GEM战役事件，并与卫星数据进行比较，以监测模拟的性能。Fok环电流模型将使用来自MHD模拟的磁场和电离层电势来驱动。前两个目标将使用模拟太阳风数据来驱动MHD模拟，以便更好地隔离单个太阳风和预处理特性的影响。磁流体模拟的偶极事件将被用来确定电离层电位和感应电场环电流动态的相对重要性。研究的第二部分将改变太阳风磁场和太阳风密度，以确定这些因素对环电流形成的相对重要性。第三部分将利用ACE卫星的太阳风数据模拟实际事件，并将结果与洛斯阿拉莫斯地球同步卫星数据进行比较。该项目将有助于利用计算机模拟更好地理解耦合非线性动力系统。这是未来空间天气预测和地球空间建模的一个基本问题。该研究将测试可能用于空间天气预测的环电流和磁流体模型。由于模型可通过社区协调建模中心的请求运行提供给科学界，因此这项工作对模型的任何改进都将提供给科学界。

This project will examine the conditions that lead to a buildup of the Earth's ring current during magnetic storms. It will utilize the Community Coordinated Modeling Center (CCMC) at Goddard Space Flight Center to simulate the development of the ring current. The global magnetohydrodynamics (MHD) simulation models at the CCMC can be coupled to the ring current model developed by M.-C. Fok. There are three main objectives to this project. The first is to determine the relative importance of multiple substorms within a storm on the ring current dynamics. The second objective is to examine how different solar wind conditions can affect the buildup of the ring current. The third is to simulate GEM campaign events and compare to satellite data to monitor the performance of the simulation. The Fok Ring Current Model will be driven using magnetic fields and ionospheric potentials from MHD simulations. The first two objectives will be met using simulated solar wind data to drive the MHD simulations so that effects of individual solar wind and preconditioning properties can be better isolated. MHD simulations of dipolarization events will be used to determine the relative importance of ionospheric potential and inductive electric fields on ring current dynamics. The second part of the study will vary the solar wind magnetic field and the solar wind density to determine the relative importance of these factors on the buildup of the ring current. The third part will use solar wind data from the ACE satellite to simulate actual events and compare the results to Los Alamos geosynchronous satellite data. The project will help provide a better understanding of the coupled nonlinear dynamical system using computer simulations. This is a fundamental problem for future space weather predictions and for geospace modeling. The study will test the ring current and MHD models that may be used for space weather prediction. Since the models are available to the scientific community through runs on request by the Community Coordinated Modeling Center, any improvements to the models resulting from this work will be available to the scientific community.