GEM: The Role of Wave-Particle Interactions in the Inner Magnetosphere

GEM：波粒相互作用在内磁层中的作用

• 批准号: 0402615
• 负责人: Richard Thorne
• 金额: $ 35.3万
• 依托单位: University of California-Los Angeles
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-11-01 至 2008-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0402615&HistoricalAwards=false
• 关键词: GEM; Role; Wave; Particle; Interactions

The principal objective of this project is a detailed understanding of the origin of magnetospheric plasma waves and the influences these waves have on the dynamical behavior of trapped magnetospheric particles. The path integrated growth rate and damping mechanisms for plasma waves will be studied in realistic model environments using a hot ray tracing code. This will establish the conditions for significant wave gain and the effectiveness of energy transfer, via the waves, to other components of the plasma. New codes will be developed to evaluate the rates of pitch-angle scattering and energy diffusion of resonant radiation belt particles with each important class of wave. Quantitative calculations will be made of the rate of particle precipitation loss to the atmosphere and of the time-scale for stochastic acceleration under different levels of geomagnetic activity. The time-scales for loss and local acceleration will be incorporated into a radial diffusion code, to model the structure of the electron radiation belts and their variability during geomagnetic activity. The excitation of plasma waves and their effect on energetic ion and electron losses will be examined as will the mechanisms responsible for acceleration of energetic electrons to relativistic energies during magnetic storms. The project will lead to a global understanding of dynamics of the ring current during magnetic storms. A synoptic model of the wave-particle processes will be developed for future integration into a Geospace General Circulation Model.

该项目的主要目标是详细了解磁层等离子体波的起源以及这些波对捕获的磁层粒子的动力学行为的影响。在真实的模式环境中，将使用热射线跟踪程序来研究等离子体波的路径积分增长率和衰减机制。这将为显著的波增益和通过波向等离子体的其他组件传递能量的有效性奠定条件。将开发新的程序来评估每一类波的共振辐射带粒子的俯仰角散射率和能量扩散率。将对不同地磁活动水平下的大气粒子降水损失率和随机加速的时间尺度进行定量计算。损失和局部加速的时间尺度将被并入径向扩散代码，以模拟电子辐射带的结构及其在地磁活动期间的变异性。本课程将研究等离子体波的激发及其对高能离子和电子损失的影响，以及在磁暴期间高能电子加速到相对论能量的机制。该项目将导致对磁暴期间环电流动力学的全球理解。将开发一个波-粒子过程的天气模式，以便将来整合到地球空间大气环流模式中。