The Interactions of Energetic Particles with the Solar Wind - A Theoretical Study

研究人员将致力于定量了解日球层的高能粒子结构，以及控制这种结构的基本过程。主要工作集中在高能粒子与太阳风相互作用的理论研究上。这些研究将是广泛的，包括太阳高能粒子、银河宇宙射线、星际吸收离子、激波加速粒子（如旋转离子事件）和太阳风本身。研究将包括高能粒子的全球空间和时间分布，以及控制它们与周围等离子体相互作用的微过程，包括高能粒子的波激发。在可能的情况下，将强调分析方法。这些研究还将强调理论预测与地面和航天器观测之间的比较，具体包括ACE、SOHO、Cluster、Wind、尤利西斯和旅行者号的观测。具体的研究课题包括日冕/行星际激波中太阳高能粒子的加速和输运的分析理论，包括质子激发波和磁聚焦，它将离子从激波附近的湍流鞘推进到行星际空间。研究人员将在太阳风中旋转相互作用区域构建一个改进的离子加速理论，包括注入机制、质子激发波鞘和加速星际吸收离子的方位不对称性。他们还将研究由于重力、双极电场、离子回旋波的磁聚焦和散射，质子和小离子在太阳风中的分布函数的演变。

The investigators will work toward a quantitative understanding of the energetic particle structure of the heliosphere and the fundamental processes that govern that structure. The main effort concentrates on theoretical studies of the interactions of energetic particles with the solar wind. The studies will be broad-based and include solar energetic particles, galactic cosmic rays, interstellar pickup ions, shock-accelerated particles such as the corotating ion events, and the solar wind itself. The investigations will include both the global spatial and temporal distributions of the energetic particles, and the microprocesses governing their interactions with the ambient plasma, including wave excitation by the energetic particles. Analytical methods will be emphasized where possible. The studies will also emphasize comparisons between the theoretical predictions and ground-based and spacecraft observations, including specifically those by ACE, SOHO, Cluster, Wind, Ulysses and Voyager. Specific topics of research include an analytical theory for the acceleration and transport of solar energetic particles at an evolving coronal/interplanetary shock including proton-excited waves and magnetic focusing, which propels ions from the turbulent sheath adjacent to the shock into interplanetary space. The investigators will construct an improved theory of ion acceleration at corotating interaction regions in the solar wind including injection mechanisms, a sheath of proton-excited waves, and azimuth asymmetry of the accelerated interstellar pickup ions. They will also investigate of the evolution of the proton and minor ion distribution functions in the solar wind due to gravity, the ambipolar electric field, magnetic focusing and scattering by ion-cyclotron waves.