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，以研究被称为？注射麻醉剂？在磁气圈中。关于磁层准周期振荡，特别是磁层进入全球准周期振荡的条件，存在着相当大的争议。根据对太阳风事件的观测数据进行的案例研究，已经报道了太阳风事件可以发生在稳定的太阳风驱动条件下，太阳风压力脉冲，行星际磁场波动甚至更复杂的太阳风驱动条件下。然而，在将太阳风压力脉冲和磁场变化的影响脱钩方面存在困难，这阻碍了在这一专题上取得进展。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脉冲和磁场变化如何影响太阳风事件的发生。 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，支持培养一名年轻的女科学家。通过这项研究开发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建模和预报风暴的能力。

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.