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.***

这笔赠款将重点扩展先前对地球磁层中水磁阿尔文波动力学特性的理论研究。 将采用短波长回旋运动形式来研究 1) 各向异性、高 β 磁层等离子体中的波激发机制，以及 2) 相应的粒子通量振荡，包括关键的有限拉莫尔半径效应。 然后将（1）和（2）的结果与观测数据进行比较，为波浪自由能源和产生机制提供一些明确的答案。 此外，还将研究磁层等离子体中的场线资源，包括有限等离子体压力以及场线资源对波激励的影响。 因此，理论结果应该为地球磁层中的地磁脉动提供重要的新物理见解和定量预测。***