Collaborative Research: Multi-Spacecraft Investigation of Hot Flow Anomalies

合作研究：热流异常的多航天器调查

• 批准号: 0963111
• 负责人: Hui Zhang
• 金额: $ 20.59万
• 依托单位: University of Alaska Fairbanks Campus
• 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: 2010-09-01 至 2014-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0963111&HistoricalAwards=false
• 关键词: Collaborative; Research; Multi; Spacecraft; Investigation

Hot Flow Anomalies (HFAs) are phenomena observed near the Earth's bow shock that are marked by strongly heated plasmas and substantial deflections in the plasma flow direction. The objective of the proposed research is to determine the characteristics of HFAs, understand how particle heating occurs inside HFAs, and determine their impact on the magnetosphere and ionosphere. The first year will be a systematic survey of hot flow anomaly events to determine the characteristics of HFAs observed upstream of the bow shock and in the magnetosheath. During the second year, the project will determine how the electrons and ions are heated and how the energetic particles (25 keV) are accelerated inside HFAs. During the third year, the impact of HFAs on the magnetosphere and ionosphere will be determined. The project will use a variety of data sets including data from the THEMIS, Cluster and Geotail spacecraft when they were located near the bow shock.The significance of the proposed work lies in the fundamental information it will provide about HFAs, which can significantly modify the solar wind-magnetosphere interaction, generate shocks, and energize particles efficiently. The study will advance our understanding of the structure and characteristics of HFAs, the physics underlying particle heating inside HFAs, and their impact on the magnetosphere and ionosphere. The interaction between the solar wind and the magnetosphere is a key element in space physics. This study will form the core of the Ph.D. thesis for a graduate student from an underrepresented minority at the Center for Atmospheric Research, University of Massachusetts, Lowell. The scientific results will be highlighted on the THEMIS science nugget website which was developed for members of the public who are interested in THEMIS science results but may not have space physics backgrounds.

热流异常 (HFA) 是在地球弓形激波附近观察到的现象，其特征是强烈加热的等离子体和等离子体流方向的大幅偏转。拟议研究的目的是确定 HFA 的特性，了解 HFA 内部粒子加热如何发生，并确定它们对磁层和电离层的影响。第一年将对热流异常事件进行系统调查，以确定在弓激波上游和磁鞘中观察到的 HFA 的特征。第二年，该项目将确定电子和离子如何加热以及高能粒子（25 keV）如何在 HFA 内加速。第三年，将确定 HFA 对磁层和电离层的影响。 该项目将使用各种数据集，包括来自位于弓激波附近的 THEMIS、Cluster 和 Geotail 航天器的数据。拟议工作的意义在于它将提供有关 HFA 的基本信息，这可以显着修改太阳风-磁层相互作用，产生冲击波，并有效地为粒子提供能量。这项研究将增进我们对 HFA 的结构和特性、HFA 内部粒子加热的物理原理及其对磁层和电离层的影响的理解。太阳风和磁层之间的相互作用是空间物理学的关键要素。这项研究将构成博士学位的核心。为洛厄尔马萨诸塞大学大气研究中心的少数族裔研究生撰写的论文。这些科学成果将在 THEMIS 科学金块网站上突出显示，该网站是为对 THEMIS 科学成果感兴趣但可能没有空间物理学背景的公众开发的。