Magnetotail Dynamics: Plasma Wave Turbulence and Particle Chaos

为了理解磁层外层的粒子如何获得能量并进入极地产生极光，需要对发生的各种物理过程的理论理解和现实模型的发展。本项目是理论和模型开发研究的延续，旨在进一步研究各种磁尾模型的混沌特性以及这些模型在尾通电过程中的应用。该项目描述了与随机粒子轨道在磁尾动力学中的作用和无碰撞电阻率的正确时间尺度相关的四个主要研究领域。这些研究包括电流片和中性线场的不可逆行为，粒子轨道的随机性，带电粒子群的响应，扩散系数及其对模型参数的依赖，所有这些都是为了理解从等离子体片边界层到等离子体片中心的粒子分布的演变。* * * / /

Theoretical understanding and development of realistic models for the various physical processes that occur are required to understand how particles in the outer regions of the magnetosphere become energized and make their way into the polar regions to produce the aurora. This project is a continuation of theoretical and model development research to further study the chaotic properties of various magnetotail models and the application of these models to tail energization processes. The project is described in four main areas of research pertinent to the role of stochastic particle orbits in magnetotail dynamics and the correct time scale for collisionless resistivity. These include studies of the irreversible behavior of current sheets and neutral line fields, the stochasticity of particle orbits, the response of ensembles of charged particles, diffusion coefficients and their dependence on model parameters, all directed towards understanding the evolution of particle distributions from the plasma sheet boundary layer to the central plasma sheet. ***//