Collaborative Research: Ionospheric Contribution to Geomagnetic Storms

这一合作项目将探讨电离层和地磁风暴动力学之间的反馈机制，并将调查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调查世界时(UT)对地磁风暴强度的依赖关系。将使用数据分析和数值实验相结合的方法来评估电离层对地磁风暴强度的UT依赖性的影响。该项目利用密歇根大学空间天气模型框架(SWMF)的建模组件进行了数值实验，以深入了解电离层对地磁风暴强度的作用。这项研究还将使用全球定位系统确定的全球总电子含量(TEC)图来描述所有级别磁活动期间的中高纬度电离层。磁活动指数和TEC数据将被用来经验性地评估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。利用空间-天气耦合模式SWMF，该项目将调查高纬度氧离子丰度随季节和磁活动的变化程度，并使用TEC数据来评估SWMF模拟的电离层部分的有效性。

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.