Kinetic Theories of Ultra-Low-Frequency Magnetic Pulsations in the Earth's Magnetosphere

地球磁层超低频磁脉动的动力学理论

• 批准号: 9211999
• 负责人: Liu Chen
• 金额: $ 0.49万
• 依托单位: Princeton University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-01-01 至 1993-07-01
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9211999&HistoricalAwards=false
• 关键词: Kinetic; Theories; Ultra; Low; Frequency

In this proposal, we plan to continue our theoretical investigations on the wave and particle dynamical properties associated with ultra-low-frequency magnetic pulsations in the Earth's magnetosphere. Specifically, we propose to study the following aspects of the drift-Alfven-ballooning modes: (i) numerical investigations of the stability properties in self- consistent, anisotropic, high-B magnetospheric plasmas: (ii) gyrokinetic analyses of associated particle flux modulations; (iii) nonlinear wave-particle interactions between energetic ring-current ions and instabilities; and (iv) nonlinear mode- coupling effects on the instabilities. (i) and (ii) thus deal with the linear aspect of the wave excitation mechanism and the purpose here is, by comparing with satellite observations, to identify the mechanisms both qualitatively and quantitatively. (iii) and (iv) meanwhile examine the nonlinear consequences of the instabilities in terms of both the saturated wave amplitudes, spectra and induced particle diffusion. Theoretical results will be compared with available observations. This proposal constitutes a major portion of a Ph.D dissertation project and, hence, a three-year grant is requested.

在这个提议中，我们计划继续我们的理论 波粒动力学性质研究 与超低频磁脉动有关， 地球的磁层。 具体而言，我们建议研究 漂移-阿尔文-气球模式的以下方面： 数值研究的稳定性性质的自我- 一致的、各向异性的、高B磁层等离子体：（ii） 伴随粒子通量调制的回旋动力学分析 (iii)能量间的非线性波粒相互作用 环电流离子和不稳定性;以及（iv）非线性模式- 耦合效应对不稳定性的影响。 (i)（2）因此， 波激励机制的线性方面和 目的是通过与卫星观测数据的比较， 从定性和定量两个方面确定机制。 (iii)（iv）同时检查非线性后果 饱和波振幅方面的不稳定性， 光谱和诱导粒子扩散。 理论结果将 与现有的观察结果进行比较。 这项建议 构成博士论文项目的主要部分， 因此，要求提供三年的赠款。