Collaborative Research: Ionospheric Contribution to Geomagnetic Storms

合作研究：电离层对地磁风暴的贡献

• 批准号: 1019065
• 负责人: Thomas Immel
• 金额: $ 23.07万
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-09-01 至 2016-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1019065&HistoricalAwards=false
• 关键词: Collaborative; Research; Ionospheric; Contribution; Geomagnetic

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.

该协作项目将解决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性风暴强度变化的可能作用。 一个特定的科学目标是对地磁风暴强度的普遍时间（UT）依赖性的研究。 数据分析和数值实验的组合将用于评估电离层对地磁风暴强度中UT依赖性的影响。 该项目使用密歇根大学太空天气建模框架（SWMF）的建模组件（SWMF）结合了数值实验，以深入了解电离层在地球风暴强度中的作用。 该研究还将使用确定的全球总电子含量（TEC）图来表征所有磁性活性级别的中间和高纬度电离层。 磁性活动指数和TEC数据将用于经验评估风暴强度上电离层的可能反馈机制。数据将进一步用于约束模型实验。 该项目使用SWMF的耦合空间天气模型，将使用TEC数据来评估SWMF模拟的电离层成分的有效性。