Kinetic Theories of Ultra-Low Frequency and Current-Sheet Instabilities in Magnetospheric Plasmas

磁层等离子体超低频和电流层不稳定性的动力学理论

• 批准号: 0852952
• 负责人: Liu Chen
• 金额: $ 24.17万
• 依托单位: University of California-Irvine
• 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: 2009-09-15 至 2013-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0852952&HistoricalAwards=false
• 关键词: Kinetic; Theories; Ultra; Low; Frequency

This project will examine ultra-low frequency (ULF) electromagnetic oscillations that are generated by energetic ions in Earth's magnetosphere. The project will utilize gyrokinetic simulations. There are several tasks involved. The first is to develop a gyro-kinetic-magnetohydrodynamic simulation code. The code will make it possible to study the internal excitations of ULF waves in a realistic plasma configuration. The results from the simulations will then be used to develop analytical theories of the waves and their stability properties. The project will examine the couplings of the energetic ions to the waves that result from the curvature of dipole-like magnetic field lines, the coupling between compressional wave modes and mirror wave modes, and the coupling of the waves to Alfvén balloon modes. The simulation and theory results will be compared with satellite measurements of ULF waves. The results of the research will have applications beyond enhancing our understanding of Earth's magnetosphere, as they will have impacts on our understanding of laboratory experiments as well. Much of the research will be carried out by a graduate student.

该项目将研究地球磁层中高能离子产生的超低频（ULF）电磁振荡。 该项目将利用回旋运动模拟。 涉及多项任务。 首先是开发陀螺运动磁流体动力学模拟代码。 该代码将使研究真实等离子体配置中 ULF 波的内部激发成为可能。 模拟结果将用于开发波浪及其稳定性特性的分析理论。 该项目将研究高能离子与类偶极子磁场线曲率产生的波的耦合、压缩波模式和镜像波模式之间的耦合，以及波与阿尔文气球模式的耦合。 模拟和理论结果将与 ULF 波的卫星测量结果进行比较。 研究结果的应用不仅限于增强我们对地球磁层的理解，因为它们也会影响我们对实验室实验的理解。 大部分研究将由研究生进行。