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(EMIC)波是地球磁层的一个共同特征，它强烈影响环电流中的离子、热电子和热/过热离子。主波在外辐射带相对论电子的形成和损失中也起着重要的作用。该项目将使用观测数据和理论建模相结合的方法来获得全球磁层尺度上的EMIC波功率谱密度(PSD)。该项目将研究EMIC PSD如何在地磁风暴的不同阶段发展。它将使用一种准线性方法来处理环形电流-EMIC波系统，该方法基于一组自洽地处理环形电流和EMIC波耦合的动力学方程。该模型将是对现有模型的发展和增强。主要任务将是(1)建立磁层等离子体中EMIC波的自洽、非反弹平均的模型，(2)在全球RC模型中包括自洽磁场计算，(3)根据星团卫星任务的观测数据验证所建EMIC波。该项目与NSF的地球空间环境模拟(GEM)计划有关。它将被证明是一个对空间天气很重要的过程的自洽模型，并将增强我们预测环流和辐射外带中的空间天气现象的能力。该项目还具有教育影响。一名本科生将接受培训，并参与这项研究。

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.