The causality between the rapid rotation of a sunspot and an X3.4 flare |
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| Authors: | Xiao-Li Yan Zhong-Quan Qu Cheng-Lin Xu Zhi-Ke Xue De-Fang Kong |
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| Institution: | [1]National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011, China; [2]Graduate School of Chinese Academy of Sciences, Beijing 100049, China [3]Yunnan Normal University, Kunming 650092, China [4]Jiaxing University, Jiaxing 314001, China |
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| Abstract: | Using multi-wavelength data of Hinode, the rapid rotation of a sunspot in ac-tive region NOAA 10930 is studied in detail. We found extraordinary counterclockwise rotation of the sunspot with positive polarity before an X3.4 flare. From a series of vector magnetograms, it is found that magnetic force lines are highly sheared along the neu-tral line accompanying the sunspot rotation. Furthermore, it is also found that sheared loops and an inverse S-shaped magnetic loop in the corona formed gradually after the sunspot rotation. The X3.4 flare can be reasonably regarded as a result of this movement. A detailed analysis provides evidence that sunspot rotation leads to magnetic field linestwisting in the photosphere. The twist is then transported into the corona and triggers flares. |
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| Keywords: | Sun sunspots-Sun flares-Sun magnetic fields |
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