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).

该项目涉及日冕物质抛射，这是从太阳猛烈喷出的等离子体，造成空间天气。了解这些喷发是如何发生的以及它们如何向地球传播，以便准确预测它们的行为至关重要。目前的太阳和空间观测站提供了前所未有的地表磁场、极紫外线和X射线日冕结构的时空覆盖。在这项研究中，数据约束的模拟CME的启动和传播将从现实的初始条件开始的磁场和等离子体的一个活跃的区域，包含一个通量绳的爆发边缘。这些模拟将提供一个独特的机会来调查CME的爆发和早期发展背后的过程。该项目有以下科学目标：1）开发高度受观测约束的CME启动模型，以研究CME的早期发展阶段; 2）限制太阳附近的CME属性（动力学、形态学、冲击和压缩区域参数），3）利用数据约束的磁流体动力学（MHD）模拟再现了观测到的CME的三部分两前锋结构及其原位性质。观测到的喷发活动区的数据约束非线性无力场模型将用作空间气象建模框架全球磁流体动力学代码的初始条件。活动区和磁绳等离子体的初始条件也将受到使用最近开发的分析技术的数据的约束。这些工具将用于将更真实的CME传播到1AU。模拟CME的特性（方向，速度，加速度，形态和冲击驱动能力）将与所有可用的观测（日冕EUV和X射线，白光和原位数据）进行比较。