Magnetospheric Wave-Particle Processes

9313158索恩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传输提供了一种重要且往往占主导地位的机制。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。这项拟议调查的一个主要目标是了解观测到的等离子体波的来源及其对行星磁层中捕获的粒子的动力学影响。重点将放在地球波-粒子相互作用上，但也将考虑将其应用于其他行星磁层中的相关现象。为了实现这些目标，将采用理论分析和大量的数值计算相结合的方法。我们将使用一种独特的热射线跟踪程序，在真实的模型等离子体环境中研究等离子体波的路径集成增长和最终衰减机制。将确定显著波增益的机制和条件，并将确定通过波向等离子体其他成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尾部，可以用Kappa分布而不是麦克斯韦分布来建模，因此将研究这一特征是否显著地改变了波的增长或衰减以及等离子体的稳定性性质。研究了内区电子的长期变化，建立了径向扩散速率和散射损耗的理论模型。还将分析内区电子降水对高层大气全球尺度化学的影响。***

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. ***