Observing the release of twist by magnetic reconnection in a solar filament eruption

Zhike Xue, Xiaoli Yan (), Xin Cheng, Liheng Yang, Yingna Su, Bernhard Kliem, Jun Zhang, Zhong Liu, Yi Bi, Yongyuan Xiang, Kai Yang and Li Zhao
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Zhike Xue: Yunnan Observatories, Chinese Academy of Sciences
Xiaoli Yan: Yunnan Observatories, Chinese Academy of Sciences
Xin Cheng: School of Astronomy and Space Science, Nanjing University
Liheng Yang: Yunnan Observatories, Chinese Academy of Sciences
Yingna Su: Key Laboratory for Dark Matter and Space Science, Purple Mountain Observatory, Chinese Academy of Sciences
Bernhard Kliem: Yunnan Observatories, Chinese Academy of Sciences
Jun Zhang: Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Sciences
Zhong Liu: Yunnan Observatories, Chinese Academy of Sciences
Yi Bi: Yunnan Observatories, Chinese Academy of Sciences
Yongyuan Xiang: Yunnan Observatories, Chinese Academy of Sciences
Kai Yang: School of Astronomy and Space Science, Nanjing University
Li Zhao: Yunnan Observatories, Chinese Academy of Sciences

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

Abstract: Abstract Magnetic reconnection is a fundamental process of topology change and energy release, taking place in plasmas on the Sun, in space, in astrophysical objects and in the laboratory. However, observational evidence has been relatively rare and typically only partial. Here we present evidence of fast reconnection in a solar filament eruption using high-resolution H-alpha images from the New Vacuum Solar Telescope, supplemented by extreme ultraviolet observations. The reconnection is seen to occur between a set of ambient chromospheric fibrils and the filament itself. This allows for the relaxation of magnetic tension in the filament by an untwisting motion, demonstrating a flux rope structure. The topology change and untwisting are also found through nonlinear force-free field modelling of the active region in combination with magnetohydrodynamic simulation. These results demonstrate a new role for reconnection in solar eruptions: the release of magnetic twist.

Date: 2016
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DOI: 10.1038/ncomms11837

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