GEM Postdoc: Investigation of the Trigger Mechanism for Sawtooth Events Using the Space Weather Modeling Framework

GEM博士后：利用空间天气模型框架研究锯齿事件的触发机制

• 批准号: 0725094
• 负责人: Calvin Robert Clauer
• 金额: $ 15.98万
• 依托单位: Virginia Polytechnic Institute and State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-08-01 至 2010-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0725094&HistoricalAwards=false
• 关键词: GEM; Postdoc; Investigation; Trigger; Mechanism

This project will utilize a combination of magnetohydrodynamics (MHD) simulation studies and data analysis to examine the phenomenon known as ?sawtooth injections? in the magnetosphere. , There is considerable controversy regarding sawtooth events, particularly the conditions that cause the magnetosphere to enter into the global quasi-periodic sawtooth oscillation. Based on case studies of sawtooth events with data observations, it has been reported that sawtooth events can occur during steady solar wind driving conditions, solar wind with pressure pulses, fluctuating interplanetary magnetic field or even more complicate solar wind driver conditions. There are, however, difficulties in decoupling the effects of solar wind pressure pulses and magnetic field changes and this has impeded progress on this topic. To overcome such data analysis problems, this project will use a global MHD model to examine how solar wind pressure pulses and magnetic field changes affect the occurrence of sawtooth events. This project will support the development of a young, woman scientist though collaborations with expert colleagues at Virginia Tech, Goddard Space Flight Center, and the University of Michigan. The understanding developed through this research will also benefit the National Space Weather program by improving our understanding of storm-time processes and our ability to model and forecast storms.

该项目将利用磁流体动力学(MHD)模拟研究和数据分析相结合的方法来研究所谓的锯齿状注入现象。在磁层中。关于锯齿事件，特别是导致磁层进入全球准周期锯齿振荡的条件，存在着相当大的争议。基于对锯齿事件的个例研究和数据观测，已有报道称，锯齿事件可以发生在稳定的太阳风驱动条件、带有压力脉冲的太阳风、行星际磁场起伏甚至更复杂的太阳风驱动条件下。然而，在分离太阳风压力脉冲和磁场变化的影响方面存在困难，这阻碍了这一专题的进展。为了克服这样的数据分析问题，该项目将使用全球MHD模型来研究太阳风压力脉冲和磁场变化如何影响锯齿事件的发生。该项目将通过与弗吉尼亚理工大学、戈达德航天飞行中心和密歇根大学的专家同事合作，支持一位年轻的女科学家的发展。通过这项研究形成的理解也将通过提高我们对风暴时间过程的理解以及我们模拟和预测风暴的能力而有益于国家空间天气计划。