Theoretical Studies on Wave and Particle Dynamics of Hydromagnetic Alfven Waves in the Earth's Magnetosphere

地球磁层中水磁阿尔文波的波粒动力学理论研究

• 批准号: 8917019
• 负责人: Liu Chen
• 金额: $ 12.26万
• 依托单位: Princeton University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-04-15 至 1992-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8917019&HistoricalAwards=false
• 关键词: Theoretical; Studies; Wave; Particle; Dynamics

This grant will focus on extending previous theoretical studies on dynamical properties of hydromagnetic Alfven waves in the Earth's magnetosphere. A short wavelength gyrokinetic formalism will be employed to study 1) the wave excitation mechanism in anisotropic, high-beta magnetospherice plasmas, and 2) the corresponding particle flux oscillation including the crucial finite Larmor-radius effects. Results from (1) and (2) will then be compared with observational data to provide some definitive answers to the wave free energy source(s) and generation mechanism(s). In addition, feld line resources in magnetospheric plasmas including finite plasma pressure and effects of field line resources on wave excitations will be studied. The theoretical results should therefore provide significant new physical insight and quantitative predications about geomagnetic pulsations in the Earth's magnetosphere.***

该赠款将着重于扩展有关地球磁层中水力磁性Alfven波的动力学特性的先前理论研究。 将采用短波长的陀螺仪形式主义来研究1）各向异性，高β磁圈等离子体中的波动激发机制，以及2）相应的粒子通量振荡，包括至关重要的有限larmor-radius效应。 然后将将（1）和（2）的结果与观测数据进行比较，以提供一些对波自由能源和发电机制的确定答案。 此外，将研究磁层等离子体中的长石资源，包括有限的等离子体压力和现场线资源对波激发的影响。 因此，理论上的结果应提供有关地球磁层中地磁脉动的重要新物理见解和定量谓词。***