The Plasma Physics of Diffusive Shock Acceleration (Atmospheric Sciences)

扩散激波加速的等离子体物理学（大气科学）

• 批准号: 9713223
• 负责人: Gary Zank
• 金额: --
• 依托单位: Bartol Research Institute
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-08-15 至 2000-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9713223&HistoricalAwards=false
• 关键词: Plasma; Physics; Diffusive; Shock; Acceleration

The investigator will consider four issues basic to improving the understanding of diffusive acceleration of particles at shocks: (1) 'injection' of low energy or thermal particles into the diffusive shock acceleration process, (2) generation and evolution of the strong turbulence responsible for scattering the energetic particles in the vicinity of a shock, (3) development of non-quasi-linear models of the cosmic ray/energetic particle diffusion coefficients, and (4) shock acceleration in a partially ionized medium. The study will develop models addressing these points, and investigate on the basis of analytical and numerical techniques. He will derive models at both a test particle and self-consistent level. Detailed modeling will be guided and complemented by multi-dimensional (1-, 2-, and 3-D) hybrid plasma simulations. The investigator hopes these studies will advance our understanding of the origin and acceleration of energetic particles and the nature of collisionless shocks.

研究者将考虑四个基本问题，以提高对冲击波中粒子扩散加速度的理解：(1)向扩散激波加速过程中“注入”低能或热粒子，(2)导致激波附近高能粒子散射的强湍流的产生和演化，(3)宇宙射线/高能粒子扩散系数的非拟线性模型的发展，以及(4)部分电离介质中的激波加速。本研究将开发模型来解决这些问题，并在分析和数值技术的基础上进行调查。他将在测试粒子和自洽水平上推导模型。详细的建模将由多维（1-，2-和3-D）混合等离子体模拟指导和补充。研究者希望这些研究能够促进我们对高能粒子的起源和加速以及无碰撞冲击的本质的理解。