Magnetospheric Wave-Particle Processes

9313158 Thorne在基本无碰撞的磁层环境中，波-粒子相互作用取代了粒子-粒子碰撞的作用;它们为俯仰角散射、能量扩散和异常交叉场输运提供了重要且往往是主导的机制。 拟议的研究将考虑这些过程，从而为我们理解波的起源以及辐射带中高能粒子的来源和损失机制做出重要贡献。 这项研究的一个主要目标是了解所观察到的等离子体波的起源及其对行星磁层中被困粒子的动力学后果。 重点将放在地球波粒子相互作用，但在其他行星磁层的相关现象的应用也将被考虑。 理论分析和广泛的数值计算相结合，将被用来实现这些目标。 路径集成等离子体波的增长和最终阻尼机制将在现实模型等离子体环境中使用一个独特的热射线跟踪代码进行研究。 将建立显著波增益的机制和条件，并确定通过波向等离子体的其他组分传递能量的有效性。 由于磁层等离子体通常包含一个高能量的尾巴，可以最好地与Kappa而不是麦克斯韦分布建模，调查将作出这一功能是否显着修改波的增长或阻尼和等离子体的稳定性。 将研究内区电子的长期变化，并建立径向扩散率和散射损失的理论模型。 还将分析内区电子降水对全球尺度高层大气化学的影响。 ***

9313158 Thorne In the basically collisionless magnetospheric environment, wave- particle interactions replace the role of particle-particle collisions; they provide an important and often dominant mechanism for pitch-angle scattering, energy diffusion and anomalous crossfield transport. The proposed study will consider such processes and consequently make important contributions to our understanding of the origin of waves and the source and loss mechanisms for energetic particles in the radiation belts. A principal objective of this proposed investigation is to understand the origin of observed plasma waves and their dynamical consequences on trapped particles in planetary magnetospheres. Emphasis will be placed on terrestrial wave-particle interactions but applications to related phenomena in other planetary magnetospheres will also be considered. A combination of theoretical analyses and extensive numerical computation will be employed to achieve these objectives. The path-integrated growth and ultimate damping mechanisms for plasma waves will be studied in realistic model plasma environments using a unique hot ray tracing code. The mechanisms and conditions for significant wave gain will be established and the effectiveness of energy transfer via the waves to other components of the plasma will be determined. Since magnetospheric plasma usually contains a high energy tail that can best be modeled with a Kappa rather than a Maxwellian distribution, an investigation will be made of whether this feature significantly modifies the growth or damping of waves and the stability properties of the plasma. The long term variability of inner zone electrons will be investigated and theoretical models will be developed for the rate of radial diffusion and scattering loss. The effect of inner zone electron precipitation on the global scale chemistry of the upper atmosphere will also be analyzed. ***