Dynamics of Radiation Belt Particles
Dynamics of Radiation Belt Particles
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DOI：
10.1007/s11214-012-9938-5
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发表时间：
2013-11
影响因子：
10.3
通讯作者：
A. Ukhorskiy;M. Sitnov
中科院分区：
文献类型：
--
作者：
A. Ukhorskiy;M. Sitnov
本文回顾了粒子动力学的基本概念，辐射带模拟和数据分析的理论方面。本文概述了准周期哈密顿系统的绝热不变量理论，导出了囚禁在辐射带中的粒子运动不变量。我们讨论了粒子与小振幅等离子体波的共振相互作用的非线性，无处不在的内部磁层，可以使粒子运动随机。随机系统的长期演化可以用Fokker-Plank（扩散）方程来描述。我们推导出粒子扩散的动力学方程的不变空间，并讨论其局限性和相关的挑战，需要解决在即将到来的辐射带模型和数据分析。
This paper reviews basic concepts of particle dynamics underlying theoretical aspect of radiation belt modeling and data analysis. We outline the theory of adiabatic invariants of quasiperiodic Hamiltonian systems and derive the invariants of particle motion trapped in the radiation belts. We discuss how the nonlinearity of resonant interaction of particles with small-amplitude plasma waves, ubiquitous across the inner magnetosphere, can make particle motion stochastic. Long-term evolution of a stochastic system can be described by the Fokker-Plank (diffusion) equation. We derive the kinetic equation of particle diffusion in the invariant space and discuss its limitations and associated challenges which need to be addressed in forthcoming radiation belt models and data analysis.