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题名: An MHD Simulation of Solar Active Region 11158 Driven with a Time-dependent Electric Field Determined from HMI Vector Magnetic Field Measurement Data
作者: Hayashi, Keiji; Feng, Xueshang; Xiong, Ming; Jiang, Chaowei
作者部门: 空间科学部
通讯作者: Hayashi, K (reprint author), Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, SIGMA Weather Grp, Beijing 100190, Peoples R China. ; Hayashi, K (reprint author), Nagoya Univ, Inst Space Earth Environm Res, Nagoya, Aichi 4648601, Japan.
关键词: magnetohydrodynamics (MHD) ; Sun: magnetic fields ; sunspots
刊名: ASTROPHYSICAL JOURNAL
ISSN号: 0004-637X
出版日期: 2018
卷号: 855, 期号:1, 页码:11
收录类别: SCI
项目资助者: Institute for Space-Earth Environment Research, Nagoya University, Japan ; National Natural Science Foundation of China [41374175, 41531073, 41574171, 41731067] ; Specialized Research Fund for State Key Laboratories
英文摘要: For realistic magnetohydrodynamics (MHD) simulation of the solar active region (AR), two types of capabilities are required. The first is the capability to calculate the bottom-boundary electric field vector, with which the observed magnetic field can be reconstructed through the induction equation. The second is a proper boundary treatment to limit the size of the sub-Alfvenic simulation region. We developed (1) a practical inversion method to yield the solar-surface electric field vector from the temporal evolution of the three components of magnetic field data maps, and (2) a characteristic-based free boundary treatment for the top and side sub-Alfvenic boundary surfaces. We simulate the temporal evolution of AR 11158 over 16 hr for testing, using Solar Dynamics Observatory/Helioseismic Magnetic Imager vector magnetic field observation data and our time-dependent three-dimensional MHD simulation with these two features. Despite several assumptions in calculating the electric field and compromises for mitigating computational difficulties at the very low beta regime, several features of the AR were reasonably retrieved, such as twisting field structures, energy accumulation comparable to an X-class flare, and sudden changes at the time of the X-flare. The present MHD model can be a first step toward more realistic modeling of AR in the future.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.nssc.ac.cn/handle/122/6193
Appears in Collections:空间科学部_期刊论文

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