Collaborative Research: Ionospheric Contribution to Geomagnetic Storms

这个合作项目将研究电离层和地磁风暴动力学之间的反馈机制，并将研究电离层对磁暴强度变化的可能作用。一个特殊的科学目标是研究地磁风暴强度与世界时（UT）的关系。将采用数据分析和数值实验相结合的方法来评价电离层对地磁风暴强度ut依赖性的影响。该项目结合了利用密歇根大学空间天气模拟框架（SWMF）建模组件的数值实验，以深入了解电离层对地磁风暴强度的作用。该研究还将使用gps确定的全球总电子含量（TEC）图来描述在各级磁活动期间的中纬度和高纬度电离层。磁活动指数和TEC数据将用于经验评价电离层对风暴强度可能的反馈机制。这些数据将进一步用于约束模型实验。利用耦合空间天气模型SWMF，该项目将研究高纬度氧离子丰度随季节和磁活动变化的程度，并利用TEC数据评估SWMF模拟中电离层成分的有效性。

This collaborative project will address feedback mechanisms between the ionosphere and geomagnetic storm dynamics and will investigate a possible role of the ionosphere on the variability of magnetic storm intensity. A particular scientific objective is the investigation of universal time (UT) dependence of geomagnetic storm intensity. A combination of data analysis and numerical experiments will be used to evaluate the effects of the ionosphere on the UT-dependence in geomagnetic storm intensity. This project incorporates numerical experiments using modeling components from the University of Michigan Space Weather Modeling Framework (SWMF) to gain insight into the role of the ionosphere on geomagnetic storm intensity. The study will also use GPS-determined global Total Electron Content (TEC) maps to characterize the middle and high latitude ionosphere during all levels of magnetic activity. Magnetic activity indices and TEC data will be used to empirically evaluate a possible feedback mechanism of the ionosphere on the storm intensity. The data will further be used to constrain the model experiments. Using the coupled space-weather model, SWMF, the project will investigate the degree to which high-latitude oxygen ion abundance changes vs. season and magnetic activity, using the TEC data to evaluate the validity of the ionospheric component of the SWMF simulations.