GEM: Assessing the Storm-Time Magnetic Distortion in the Inner Magnetosphere

GEM：评估内磁层风暴时磁畸变

• 批准号: 0802705
• 负责人: Michael Liemohn
• 金额: $ 39.68万
• 依托单位: Regents of the University of Michigan - Ann Arbor
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-02-01 至 2014-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0802705&HistoricalAwards=false
• 关键词: GEM; Assessing; Storm; Time; Magnetic

This project will conduct a quantitative and systematic investigation of the processes controlling the inner magnetospheric magnetic topology during geomagnetic storms. Selected storm events will be simulated with several numerical models and the results will be compared with each other and with observations. The data and model comparisons will make it possible to estimate the storm-time distortion of the magnetic field in the inner magnetosphere and to determine what current systems are responsible for which aspects of this distortion. The codes include the following: the Hot Electron and Ion Drift Integrator (HEIDI), the Inner Magnetosphere Particle Transport and Acceleration Model (IMPTAM), and the Space Weather Modeling Framework (SWMF, and the models coupled therein). This study will include extensive data analysis, particularly of magnetospheric magnetic field measurements and near-Earth plasma data (especially from Polar, Geotail, FAST, GOES and LANL geosynchronous satellites, and IMAGE), and ground-based magnetic perturbation observations. The primary objective of the study is to quantify which of the major current systems cause what aspects of the inner magnetospheric field distortion during storms. The project will examine specific storm events with physics-based numerical models to understand the flow of plasma leading to the current systems that dominate the magnetic field distortions. The relative contributions to the inner magnetosphere by convective or inductive electric fields will also be examined. The role of the plasma sheet density, temperature, and structure will be assessed to determine the influence of localized injections on the magnetic field distortions. The project involves an international collaboration and promoting underrepresented groups by bringing a woman scientist, Dr. Ganushkina of the Finnish Meteorological Institute, to Michigan to work directly with the Principal Investigator (PI).

本项目将对地磁风暴期间控制内磁层磁拓扑的过程进行定量和系统的研究。选定的风暴事件将用几个数值模式模拟，结果将相互比较并与观测结果进行比较。数据和模型比较将使我们有可能估计风暴时间内磁层内磁场的畸变，并确定哪些电流系统对这种畸变的哪些方面负责。代码包括：热电子和离子漂移积分器（HEIDI）、内磁层粒子输运和加速模型（IMPTAM）和空间天气模拟框架（SWMF）及其耦合模型。这项研究将包括广泛的数据分析，特别是磁层磁场测量和近地等离子体数据（特别是来自极地、Geotail、FAST、GOES和LANL地球同步卫星以及IMAGE），以及地面磁扰动观测。这项研究的主要目的是量化在风暴期间哪个主要的电流系统引起了内部磁层场的哪些方面的畸变。该项目将使用基于物理的数值模型来研究特定的风暴事件，以了解导致主导磁场扭曲的当前系统的等离子体流。对流电场或感应电场对内磁层的相对贡献也将加以研究。将评估等离子体片密度、温度和结构的作用，以确定局部注入对磁场畸变的影响。该项目涉及国际合作，并通过将芬兰气象研究所的女科学家Ganushkina博士带到密歇根直接与首席研究员（PI）合作，促进代表性不足的群体。