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

该团队提出了一项为期三年的研究计划，利用先进成分探测器(ACE)和Wind(可能还有接近1AU的STEREO(日地关系天文台)、高、低太阳纬度的尤利西斯，以及前往土星的卡西尼号)的最先进成分测量来模拟~1至10AU之间3D日光层中过热离子群的时空演变。提出者计划开发一个理论框架，以了解超热尾巴变化的主要原因，并通过内日光层对其动力学特性进行建模。他们还计划研究过热尾巴的内在变异性对日球层中与日冕物质抛射(CME)激波相关的离子种群的影响。所得到的数值模式将为内日光层中过热种子种群的动力学性质提供一个现实的处方，并最终可能被未来的CME发起、演化、传播和太阳高能粒子(SEP)加速的端到端全球模式所利用。这项拟议的工作还将首次探索在内日光层产生过热离子的随机加速机制的空间和时间相关性。这将为更广泛的理论研究提供坚实的基础，这些研究涉及在各种天体物理地点产生超热离子，包括终止激波、太阳耀斑和超新星冲击。这一努力还有助于开发全球空间气象监测系统，以准确预测CME/SEP事件期间的辐射水平。几名研究生和本科生将通过该项目获得部分资助。提倡者已经建立了辅导学生的良好记录。

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.