NSWP: Space Weather--Three-Dimensional Models of Coronal Mass Ejection (CME) Onset and Evolution

NSWP：空间天气——日冕物质抛射（CME）发生和演化的三维模型

• 批准号: 0518218
• 负责人: Terry Forbes
• 金额: $ 35.41万
• 依托单位: University of New Hampshire
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-09-01 至 2009-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0518218&HistoricalAwards=false
• 关键词: NSWP; Space; Weather; Three; Dimensional

The proposers plan a series of three-Dimensional (3D) analytical and numerical projects to investigate the triggering of Coronal Mass Ejections (CMEs) and to model the evolution of the coronal magnetic field following CME onset. The proposed analytical work would fully develop a 3D line-tied flux rope model, starting from the PI's recent preliminary results, in order to explore the consequences for equilibrium and stability of this configuration. The analytical model is derived from the 3D equilibrium magnetic configuration presented by Titov & Demoulin [1999], which the PI has extended to allow for line-tied motions of the flux rope. The proposers would determine the equilibrium properties of such a magnetic flux rope when its footpoints remain anchored in the solar surface, then obtain the model conditions leading to eruption, and ultimately evaluate the energy available to drive the CME. The PI intended to modify the initial Titov & Demoulin model to provide the capability to study different loss-of-equilibrium, breakout, and tether-cutting mechanisms. The proposed analytical and numerical work would also produce models of the 3D coronal magnetic field during the eruption. The proposers would analyze the predicted connectivity of these fields to yield the structure and evolution of observable features such as sigmoids, CME ribbons, and transient coronal holes. This work will ultimately explain how the sudden release of coronal magnetic energy is triggered to cause the onset of a CME. The PI and Co-PI will supervise two PhD students who are supported by other grants from National Science Foundation. The research proposed here will inform and enrich the education of those students, through the close interaction of this work with their separate, but related, thesis projects.

提议者计划一系列三维（3D）分析和数值项目，以研究日冕物质抛射（CME）的触发，并模拟CME发生后日冕磁场的演变。拟议的分析工作将充分开发一个3D线绑磁通绳模型，从PI的最近的初步结果，以探讨这种配置的平衡和稳定性的后果。分析模型是从Titov Demoulin [1999]提出的3D平衡磁位形导出的，PI已经扩展了该磁位形，以允许磁通绳的线束缚运动。提议者将确定这种磁通绳的平衡特性，当它的足点保持锚定在太阳表面时，然后获得导致爆发的模型条件，并最终评估可用于驱动CME的能量。PI旨在修改初始Titov Demoulin模型，以提供研究不同平衡丧失、突破和系绳切割机制的能力。拟议的分析和数值工作还将产生喷发期间三维日冕磁场的模型。建议者将分析这些场的预测连通性，以产生可观测特征的结构和演化，如S形，CME带和瞬态冕洞。这项工作将最终解释日冕磁场能量的突然释放是如何引发CME的发生的。PI和Co-PI将指导两名博士生，他们得到了美国国家科学基金会的其他赠款。这里提出的研究将通过这项工作与他们单独但相关的论文项目的密切互动，为这些学生的教育提供信息和丰富。