Kinetik planetarer Ringe: Implikationen für die Cassini Mission

行星环动力学：对卡西尼号任务的影响

• 批准号: 5420033
• 负责人: Professor Dr. Frank Spahn, Ph.D.
• 金额: --
• 依托单位: Institut für Physik und Astronomie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2004
• 资助国家: 德国
• 起止时间: 2003-12-31 至 2007-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5420033?language=en
• 关键词: Kinetik; planetarer; Ringe; Implikationen; die

The main goal of the proposed project is to derive an extended hydrodynamic description of planetary rings based on a kinetic theory including an impact-velocity dependent restitution coefficient based on plasto-visco-elastic dissipation during collisions. Processes of aggregation, fragmentation, the influence of self-gravity and of anisotropies shall be included in the basic kinetics. Solutions of the related equations will provide the dynamics of the mass spectrum and the velocity distribution. By applying Chapman-Enskog expansion or Grad moment approach, hydrodynamic equations and transport coefficients appropriate for planetary rings will be derived. The characteristics of these macroscopic equations will be analyzed in dependence on the particle interactions. Implications for the generation of dissipative structures will be verified. The results of these investigations will be compared with observations of the space-mission Cassini - arriving at Saturn in summer 2004.

提出的项目的主要目标是基于动力学理论推导出行星环的扩展流体动力学描述，包括基于碰撞过程中塑性粘弹性耗散的撞击速度相关恢复系数。聚集、破碎、自重力和各向异性的影响过程应包括在基本动力学中。相关方程的解将提供质谱的动力学和速度分布。应用Chapman-Enskog展开法或Grad矩法，推导出适于行星环的流体动力学方程和输运系数。这些宏观方程的特性将根据粒子相互作用来分析。对耗散结构产生的影响将得到验证。这些调查的结果将与2004年夏天到达土星的卡西尼号太空任务的观测结果进行比较。