The surge-like eruption of a miniature filament associated with circular flare ribbon |
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| Authors: | Haidong Li Jiayan Yang Yunchun Jiang Yi Bi Zhining Qu Hechao Chen |
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| Institution: | 1.Yunnan Observatories,Chinese Academy of Sciences,Kunming,China;2.Center for Astronomical Mega-Science,Chinese Academy of Sciences,Beijing,China;3.University of Chinese Academy of Sciences,Beijing,China;4.Department of Physics, School of Science,Sichuan University of Science and Engineering,Zigong,China |
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| Abstract: | We present a study of a mini-filament erupting in association with a circular ribbon flare observed by NVST and SDO/AIA on 2014 March 17. The filament was located at one footpoint region of a large loops. The potential field extrapolation shows that it was embedded under a magnetic null point configuration. First, we observed a brightening of the filament at the corresponding EUV images, close to one end of the filament. With time evolution, a circular flare ribbon was observed around the filament at the onset of the eruption, which is regarded as a signature of reconnection at the null point. After the filament activation, its eruption took the form of a surge, which ejected along one end of a large-scale closed coronal loops with a curtain-like shape. We conjecture that the null point reconnection may facilitate the eruption of the filament. |
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