太阳爆发活动源区三维非势磁场重构的MHD方法研究

项目名称： 太阳爆发活动源区三维非势磁场重构的MHD方法研究

项目编号： No.41204126

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 地球物理学和空间物理学

项目作者： 江朝伟

作者单位： 中国科学院空间科学与应用研究中心

项目金额： 26万元

中文摘要： 空间天气事件起因于太阳爆发活动如耀斑和CME，理解太阳爆发活动的关键在于获得源区的三维磁场。由于目前日冕磁场尚难以直接测量，人们普遍采用磁场重构的办法将易观测的光球面二维磁场外推到三维日冕。近年来高精度大视场的矢量磁图不断出现，给传统的重构方法带来了极大挑战，因此发展高精度高效率的磁场重构技术来分析这些大型观测资料显得尤为紧迫和必要。本项目将基于MHD演化方法，充分利用我们在高精度数值格式、并行自适应曲线网格以及开发大型MHD应用的技术优势和丰富经验，建立一种精确高效的日冕活动区三维磁场重构的新方法，并实现首个基于矢量磁图的全球面日冕非势性磁场的重建。该方法将应用于SDO/HMI的高质量、大视场及全日面矢量磁图，来研究太阳爆发源区局部和全局的三维磁拓扑结构，以理解爆发活动的磁场机制；并可用重构的三维非势磁场初始化大型的太阳风暴三维模式，为建立基于物理的空间天气预报模式服务。

中文关键词： 日冕磁场；三维重构；CESE-MHD 数值方法；并行自适应技术；

英文摘要： Space-weather events originate from solar eruptive activities such as solar flares and coronal mass ejections (CMEs), and determining the three-dimensional (3D) structure of the coronal fields associated with the eruptions is key to understanding how the eruptions are produced. Routine measurements of the solar magnetic field vector are traditionally carried out in the photosphere, while the coronal fields are usually extrapolated from photospheric magnetogram basing on some non-potential models. The currently available methods for coronal field extrapolation have only limited success when applied to real solar data, so further improvements in modeling techniques are urgently needed, especially considering that high-resolution, large field-of-view magnetograms are routinely available from the Solar Dynamics Observatory (SDO). In this proposal, we will develop a new high-accuracy and high-performance extrapolation code for the 3D coronal fields to meet such need. This project takes advantage of our new-developed CESE-MHD method in general curvilinear coordinates with AMR (adaptive mesh refinement) grid technology and rich experience in developing large-scale MHD applications. We plan to apply the new method to the high-quality vector magnetograms from SDO/HMI to study the 3D magnetic topology of the active region

英文关键词： Coronal Magnetic Field；3D Reconstruction；CESE-MHD Numerical Method；Parallel-AMR Technique；