The Role of Large-scale, Merging Solar Wind Fluctuations in the Time-dependent Modulation of Cosmic Rays in the Heliosphere

大规模合并太阳风脉动在日光层宇宙射线随时间调制中的作用

• 批准号: 0112772
• 负责人: Jakobus Le Roux
• 金额: $ 33.41万
• 依托单位: University of California-Riverside
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-06-01 至 2005-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0112772&HistoricalAwards=false
• 关键词: Role; Large; scale; Merging; Solar

A new axisymmetric magnetohydrodynamic (MHD) code will be developed for determining the evolution of the solar wind as a function of both heliocentric distance and helioaltitude. It will include the effects of the solar wind termination shock, and the interstellar pick up ions. Stream and transient structures will be imposed at the inner boundary using single-point spacecraft measurements combined with an helioaltitude extrapolation scheme inferred from Ulysses and SOHO observations. This MHD code will be combined with an existing axisymmetric cosmic ray transport code which accounts for particle drifts and allows the prescription of a very general diffusion tensor. The resulting compound code will greatly enhance our capability to understand the primary causes of galactic cosmic ray modulation throughout the solar cycle.

将开发一种新的轴对称磁流体动力学（MHD）代码，用于确定太阳风的演化作为日心距离和日高度的函数。它将包括太阳风终止激波和星际拾取离子的影响。将使用单点航天器测量结合根据 Ulysses 和 SOHO 观测推断的日高度外推方案，在内边界处强加流和瞬态结构。该 MHD 代码将与现有的轴对称宇宙射线传输代码相结合，该代码考虑了粒子漂移并允许制定非常通用的扩散张量。由此产生的复合代码将极大地增强我们理解整个太阳周期中银河宇宙射线调制的主要原因的能力。