Collaborative Research: SHINE: Data-constrained Simulations of Coronal Mass Ejection Initiation and Propagation

合作研究：SHINE：日冕物质抛射引发和传播的数据约束模拟

• 批准号: 1460188
• 负责人: Jie Zhang
• 金额: $ 16.25万
• 依托单位: George Mason University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-07-15 至 2018-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1460188&HistoricalAwards=false
• 关键词: Collaborative; Research; SHINE; Data; constrained

This project addresses coronal mass ejections (CMEs) which are violent expulsions of plasma from the Sun that contribute to space weather. It is vital to understand how these eruptions happen and how they propagate towards Earth in order to accurately predict their behavior. The current fleet of solar and space observatories provides unprecedented temporal and spatial coverage of the surface magnetic field, extreme ultraviolet (EUV) and X-ray coronal structures. In this study, data-constrained simulations of CME initiation and propagation will be performed starting from realistic initial conditions for the magnetic field and plasma of an active region that contains a flux rope on the verge of eruption. These simulations will provide a unique opportunity to investigate the processes behind the eruption and early development of CMEs. The project has the following science objectives: 1) Develop models of CME initiation that are highly constrained by observations in order to study the early development phases of CMEs; 2) Constrain CME properties near the Sun (kinetics, morphology, shock and compression region parameters) based on the flux rope properties and the ambient coronal field, and 3) Reproduce the observed three-part and two-front structure of CMEs and their in situ properties using data-constrained magnetohydrodynamic (MHD) simulations. Data-constrained non-linear force-free field (NLFFF) models of observed erupting active regions will be used as initial conditions to the Space Weather Modeling Framework (SWMF) global MHD code. The initial conditions on the active region and flux rope plasma will also be constrained by data using recently developed analysis techniques. These tools will be used to propagate more realistic CMEs to 1AU. The properties of the simulated CMEs (direction, velocity, acceleration, morphology, and shock-driving capability) will be compared with all available observations (coronal EUV and X-ray, white-light and in situ data).

该项目涉及冠状动脉弹出（CME），这些冠状会导致血浆暴力驱逐有助于太空天气。了解这些喷发是如何发生的以及它们如何向地球传播以准确预测其行为至关重要。当前的太阳能和空间天文台的车队提供了表面磁场，极端紫外线（EUV）和X射线冠状结构的前所未有的时间和空间覆盖。在这项研究中，将从磁场的现实初始条件和活性区域的等离子体开始进行CME启动和传播的数据约束模拟，该条件在喷发的边缘含有通量绳。这些模拟将为调查CMES喷发和早期发展的过程提供独特的机会。该项目具有以下科学目标：1）开发CME启动模型，这些模型受到观察的高度限制，以研究CME的早期发展阶段； 2）根据磁通绳特性和环境冠状场约束阳光附近的CME特性（动力学，形态，冲击和压缩区域参数），以及3）使用数据构成的磁氢化动力学（MHD）模拟。观察到的活跃区域的数据约束的非线性无线场（NLFFF）模型将用作空间天气建模框架（SWMF）全局MHD代码的初始条件。使用最近开发的分析技术的数据，活性区域和通量绳等血浆上的初始条件也将受到限制。这些工具将用于将更现实的CME传播到1AU。模拟CME的性能（方向，速度，加速度，形态和冲击驱动能力）将与所有可用观测值（冠状EUV和X射线，白光和原位数据）进行比较。