A Self-Consistent Ideal MHD Simulation for the Study of the Equilibrium and Dynamical Evolution of Coronal Helmet Streamers Containing Cavity and Prominence

含空洞和日珥的头盔流光平衡和动力学演化研究的自洽理想磁力流体模拟

• 批准号: 9633629
• 负责人: Shi Wu
• 金额: $ 16.28万
• 依托单位: University of Alabama in Huntsville
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-02-01 至 2000-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9633629&HistoricalAwards=false
• 关键词: Self; Consistent; Ideal; MHD; Simulation

This three-year program will construct helmet streamer solutions containing a cavity flux rope and a prominence in its closed field region. The solutions will study the initiation and propagation of coronal mass ejections by investigating their dynamical evolution due to photospheric shear motion. Using a 2 1/2 dimensional MHD code (incorporating the characteristics in the boundary conditions), the PI will construct a quasi-static helmet-streamer solution. This solution will be used to quantitatively study the equilibrium structure, force balance and energy content in detail and compare with observations. Using the helmet streamer as an initial state, the PI will also study its dynamical evolution due to photospheric shear motions. The shear is anticipated to cause the streamer to erupt impulsively, and the helmet dome, cavity and prominence will form typical three-part looplike coronal mass ejections. In all, this work will generate a more physically realistic pre-event coronal atmosphere, reveal the physical mechanisms that cause the initiation of coronal mass ejections, and address the fundamental question of the energy source of coronal mass ejections.

这个为期三年的计划将构建头盔流光解决方案，其中包含一个空腔通量绳和一个突出的封闭领域。 这些解决方案将通过调查由于光球剪切运动引起的日冕物质抛射的动力学演化来研究日冕物质抛射的起始和传播。 使用2 1/2维MHD代码（将边界条件中的特征结合起来），PI将构造准静态头盔-拖缆解。 该解将用于详细定量研究平衡结构、力平衡和能量含量，并与观测结果进行比较。 使用头盔流光作为初始状态，PI还将研究由于光球剪切运动的动力学演化。 剪切预计将导致流光冲动爆发，头盔圆顶，空腔和突出将形成典型的三部分环状日冕物质抛射。 总之，这项工作将产生一个物理上更真实的事件前日冕大气，揭示导致日冕物质抛射开始的物理机制，并解决日冕物质抛射能量来源的基本问题。