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

GEM：地球磁层环流、等离子体层和电离层耦合系统中的电磁离子回旋波

• 批准号: 1203516
• 负责人: Konstantin Gamayunov
• 金额: $ 30万
• 依托单位: Florida Institute of Technology
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-06-01 至 2016-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1203516&HistoricalAwards=false
• 关键词: GEM; Electromagnetic; Ion; Cyclotron; Waves

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.

电磁离子回旋（EMIC）波是地球磁层的一个共同特征，强烈影响环电流中的离子、热电子和热/超热离子。 EMIC波在外辐射带中对相对论电子的形成和损失也起着重要的作用。 该项目将使用观测数据和理论模型相结合的方法，以获得全球磁层尺度上的EMIC波功率谱密度。 该项目将研究EMIC PSD如何在地磁风暴的不同阶段发展。它将使用一个准线性方法的环电流EMIC波系统，是基于一组自洽处理环电流和EMIC波的耦合的动力学方程。该模型将是现有模型的发展和增强。 主要任务是（1）建立磁层等离子体中自洽的、非反弹平均的EMIC波模型;（2）在全球RC模型中包括自洽的磁场计算;（3）根据Cluster卫星使命的观测数据验证模型化的EMIC波。 它将被证明是空间天气中重要过程的自洽模型，并将提高我们预测环流和外辐射带中空间天气现象的能力。该项目也具有教育影响。一名本科生将接受培训并参与本研究。