The Current-Voltage Relationship in Large-scale Magnetosphere-Ionosphere Coupling

大尺度磁层-电离层耦合中的电流-电压关系

• 批准号: 0951420
• 负责人: Haje Korth
• 金额: $ 27万
• 依托单位: Johns Hopkins University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-05-01 至 2015-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0951420&HistoricalAwards=false
• 关键词: Current; Voltage; Relationship; Large; scale

The project addresses three main questions: (1) What is the dependence of auroral precipitation on field-aligned current (Birkeland current) density, the ionospheric plasma properties and the EUV ionization; (2) what are the distributions of auroral precipitation associated with different distributions of Birkeland currents; and (3) how well does the Knight relationship actually compare to direct observations of the Birkeland currents? The tools to be used for this study will be the database of stable Birkeleand currents derived from the magnetometer data from the Iridium satellite constellation. The Birkeland current data will be used in combination with data from a variety of spacecraft, including TIMED, Polar, Cluster, and DMSP.Field-aligned currents, also called Birkeland currents, provide the primary mechanism by which the magnetosphere is coupled to the ionosphere. Understanding how the current systems, both upward currents and downward currents, depend on the details of the charged particle precipitation and the accelerating voltage is critical to our ability to successfully model magnetosphere-ionosphere coupling and being able to generate realistic forecasts of the processes for space weather events.

该项目解决三个主要问题：（1）极光降水对场向电流（伯克兰电流）密度、电离层等离子体特性和极紫外线电离的依赖性是什么;（2）与伯克兰电流不同分布相关的极光降水分布是什么;（3）与直接观测伯克兰电流相比，奈特关系实际上有多好？ 这项研究所使用的工具将是从铱卫星星座的磁力计数据得出的稳定的Birkeleand电流数据库。Birkeland电流数据将与来自各种航天器的数据结合使用，包括TIMED、Polar、Cluster和DMSP。场向电流，也称为Birkeland电流，提供了磁层与电离层耦合的主要机制。 了解电流系统（包括向上电流和向下电流）如何取决于带电粒子沉淀和加速电压的细节，对于我们成功模拟磁层-电离层耦合并能够对空间天气事件的过程进行现实预测的能力至关重要。