GEM: Electromagnetic Ion Cyclotron Waves in a Coupled System of the Earth's Magnetospheric Ring Current, Plasmasphere, and Ionosphere

电磁离子回旋波是地球磁层的共同特征，强烈影响环电流中的离子、热电子和热/超热离子。在外辐射带相对论电子的形成和损失中，位源波也起着重要的作用。该项目将利用观测数据和理论模型相结合的方法，在全球磁层尺度上获得地磁波功率谱密度（PSD）。该项目将研究在地磁风暴的不同阶段，磁场PSD是如何发展的。它将使用一种准线性方法来研究环电流-位波系统，该系统基于一组自洽地处理环电流和位波耦合的动力学方程。该模型将是现有模型的发展和增强。主要任务将是(1)建立一个自洽的、非反弹平均的磁层等离子体的地向波模型，(2)在全球RC模型中包含一个自洽的磁场计算，(3)根据Cluster卫星任务的观测数据验证模拟的地向波。本课题与NSF地球空间环境建模（GEM）项目相关。它将被证明是一个对空间天气非常重要的过程的自洽模型，并将增强我们预测环电流和外辐射带空间天气现象的能力。该项目对教育也有影响。本研究将训练一名本科生参与。

Electromagnetic ion cyclotron (EMIC) waves are a common feature of the Earth's magnetosphere and strongly affect ions, thermal electrons, and thermal/suprathermal ions in ring current. EMIC waves also play in important role in the formation and loss of relativistic electrons in the outer radiation belt. This project will use a combination of observational data and theoretical modeling to obtain the EMIC wave power spectral density (PSD) on a global magnetospheric scale. The project will examine how the EMIC PSD develops throughout the different phases of geomagnetic storms. It will use a quasi-linear approach to the Ring Current-EMIC wave system that is based on a set of the kinetic equations that self-consistently treat the coupling of the ring current and EMIC waves. The model will be a development and enhancement of existing model. The major tasks will be (1) to develop a self-consistent, non-bounce-averaged, model of EMIC waves in the magnetospheric plasma, (2) to include a self-consistent magnetic field calculation in the global RC model, (3) to verify the modeled EMIC waves against the observational data from the Cluster satellite mission.This project is relevant to NSF's Geospace Environment Modeling (GEM) program. It will proved a self-consistent model of processes that are important in space weather and will enhance our ability to forecast space weather phenomena in the ring current and out radiation belt. The project has educational impacts as well. An undergraduate student will be trained and involved in this study.