磁层环境对非线性波粒相互作用的影响

波粒相互作用（wave-particle interaction）在辐射带粒子动力学演化过程中起着至关重要的作用。目前认为，非线性波粒相互作用是造成辐射带粒子快速变化的重要因素之一。过去的研究主要考虑了偶极磁场和冷等离子体近似下的非线性波粒相互作用。但是，在地磁扰动时期，偶极磁场模型和冷等离子体近似并不总是满足的。本项目拟通过带电粒子在电磁场中的运动方程，建立一个非偶极磁场条件下、包含热等离子体效应的试验粒子模型，并利用该模型参数化研究背景磁场和热等离子体变化对非线性波粒相互作用的影响。同时，模型将结合卫星观测数据，研究真实空间环境中的非线性波粒相互作用及其造成的辐射带高能电子的变化。

Wave-particle interaction plays a key role in the evolution of radiation belt particles. Nonlinear wave-particle interaction is suggested to greatly contribute to the rapid changes of radiation belt particles. Previous studies on the nonlinear wave-particle interaction are mostly under the assumptions of the dipole magnetic field and the cold plasma approximation. However, these two assumptions are sometimes inappropriate during the active times. This project is aimed at developing a test-particle model including the hot plasma effect in a non-dipole magnetic field model on the basic of particle motion equations in the electromagnetic field. Based on this model, a parametric study will be conducted to investigate how the background magnetic field and hot plasmas impact on the nonlinear wave-particle interaction. Combined with in-situ measurements from satellites, the model will be applied to study the nonlinear wave-particle interaction and its effect on the changes of radiation belt electrons in the realistic space environment.