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

这项资助将集中于扩展先前关于地球磁层中磁阿尔芬波动力学特性的理论研究。短波陀螺动力学将用于研究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larmorr -半径效应。然后将(1)和(2)的结果与观测数据进行比较，以对波的自由能来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，包括有限的等离子体压力和场线资源对波激发的影响。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的物理见解和定量预测

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.***