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

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来研究被称为？锯齿注射吗?在磁层中。关于锯齿状事件，特别是引起磁层进入全球准周期锯齿状振荡的条件，存在相当大的争议。基于数据观测对锯齿状事件的案例研究，有报道称锯齿状事件可能发生在稳定的太阳风驱动条件下、具有压力脉冲的太阳风、波动的行星际磁场甚至更复杂的太阳风驱动条件下。然而，在解耦太阳风压力脉冲和磁场变化的影响方面存在困难，这阻碍了这一主题的进展。为了克服这些数据分析问题，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状事件的发生。该项目将通过与弗吉尼亚理工大学、戈达德太空飞行中心和密歇根大学的专家同事合作，支持年轻女性科学家的发展。通过这项研究得出的理解也将有利于国家空间天气计划，提高我们对风暴时间过程的理解，以及我们模拟和预报风暴的能力。

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.