Collaborative Research: SHINE--Dynamical Properties of Suprathermal Ions in the Three-Dimensional (3D)-Heliosphere

合作研究：SHINE——三维（3D）日光层中超热离子的动力学特性

• 批准号: 0550905
• 负责人: Nathan Schwadron
• 金额: --
• 依托单位: Trustees of Boston University
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-02-15 至 2009-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0550905&HistoricalAwards=false
• 关键词: Collaborative; Research; SHINE; Dynamical; Properties

This team proposes a three-year research program to use state-of-the-art composition measurements from Advanced Composition Explorer (ACE) and Wind (and possibly STEREO (Solar Terrestrial Relations Observatory) near 1 AU, Ulysses at high-and-low solar latitudes, and Cassini en route to Saturn) to model the temporal and spatial evolution of the suprathermal ion population in the 3D-heliosphere between ~1 and 10 AU. The proposers plan to develop a theoretical framework for understanding the main causes of the variability of the suprathermal tail and model its dynamical properties through the inner heliosphere. They also plan to investigate the effects of the inherent variability of the suprathermal tail on coronal mass ejection (CME) shock-associated ion populations in the heliosphere. The resultant numerical model will provide a realistic prescription for the dynamical properties of the suprathermal seed population through the inner heliosphere and could ultimately be utilized by future end-to-end global models of CME initiation, evolution, propagation, and solar energetic particle (SEP) acceleration. The proposed work also will probe, for the first time, the spatial and temporal dependence of stochastic acceleration mechanisms that produce suprathermal ions in the inner heliosphere. This will provide a sound basis for enabling broader theoretical investigations involving the production of suprathermal ions at a variety of astrophysical sites, including the termination shock, solar flares, and supernova shocks. This effort could also aid the development of a global space weather monitoring system to accurately predict radiation levels during CME/SEP events. Several graduate and undergraduate students will be partially supported through this project. The proposers have established a strong record of mentoring students.

该团队提出了一个为期三年的研究计划，使用先进的成分探测器（ACE）和风（可能还有STEREO（日地关系天文台）接近1 Au，太阳高纬度和低纬度的太阳能卫星，以及前往土星的卡西尼号）的最先进的成分测量来模拟三维日光层中超热离子群的时间和空间演变。提议者计划制定一个理论框架，以了解超热尾变化的主要原因，并通过内日光层模拟其动力学特性。他们还计划研究超热尾的固有可变性对日冕物质抛射（CME）冲击相关的日光层离子种群的影响。由此产生的数值模型将提供一个现实的处方超热种子人口的动力学特性，通过内日光层，并最终可以利用未来的端到端的全球模型CME的启动，演变，传播，和太阳能高能粒子（SEP）加速。拟议的工作还将首次探索在内日球层中产生超热离子的随机加速机制的空间和时间依赖性。这将提供一个良好的基础，使更广泛的理论研究，涉及生产超热离子在各种天体物理学网站，包括终止冲击，太阳耀斑，超新星冲击。这项工作还有助于开发全球空间天气监测系统，以准确预测CME/SEP事件期间的辐射水平。一些研究生和本科生将通过这个项目得到部分支持。提议者在指导学生方面建立了良好的记录。