Data-driven magnetohydrodynamic modelling of a flux-emerging active region leading to solar eruption

Chaowei Jiang (), S. T. Wu, Xuesheng Feng () and Qiang Hu
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Chaowei Jiang: SIGMA Weather Group, State Key Laboratory for Space Weather, National Space Science Center, Chinese Academy of Sciences, No.1 Nan-Er-Tiao, Zhong-Guan-Cun, Hai-Dian District, Beijing 100190, China
S. T. Wu: Center for Space Plasma & Aeronomic Research, The University of Alabama in Huntsville
Xuesheng Feng: SIGMA Weather Group, State Key Laboratory for Space Weather, National Space Science Center, Chinese Academy of Sciences, No.1 Nan-Er-Tiao, Zhong-Guan-Cun, Hai-Dian District, Beijing 100190, China
Qiang Hu: Center for Space Plasma & Aeronomic Research, The University of Alabama in Huntsville

Nature Communications, 2016, vol. 7, issue 1, 1-11

Abstract: Abstract Solar eruptions are well-recognized as major drivers of space weather but what causes them remains an open question. Here we show how an eruption is initiated in a non-potential magnetic flux-emerging region using magnetohydrodynamic modelling driven directly by solar magnetograms. Our model simulates the coronal magnetic field following a long-duration quasi-static evolution to its fast eruption. The field morphology resembles a set of extreme ultraviolet images for the whole process. Study of the magnetic field suggests that in this event, the key transition from the pre-eruptive to eruptive state is due to the establishment of a positive feedback between the upward expansion of internal stressed magnetic arcades of new emergence and an external magnetic reconnection which triggers the eruption. Such a nearly realistic simulation of a solar eruption from origin to onset can provide important insight into its cause, and also has the potential for improving space weather modelling.

Date: 2016
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DOI: 10.1038/ncomms11522

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