Apr 03, 2019
In a recent study published in The Astrophysical Journal, a research group led by Dr. YANG Bo from Yunnan Observatories of Chinese Academy of Sciences reported the perspective on the triggering mechanism of the filament eruption onset and the formation mechanism of filament.
Researchers detailed the eruption and revealed the reformation of a filament caused by a newly emerging magnetic flux which emerged close to the negative ends of the filament in National Oceanic and Atmospheric Administration (NOAA) Active Region (AR) 11791 on July 15, 2013.
They found observational evidence indicating that multiple interactions occurred between the emerging magnetic fields and the coronal loops overlying the filament. Besides, they revealed that a remarkable sigmoid structure was formed and lifted up together with the filament, and they finally erupted together and produced a coronal mass ejection (CME).
After the eruption, the emerging magnetic fields continued to reconnect with the remaining filament channel, resulting in the reformation of the filament.
It is worth noting that 1 meter New Vacuum Solar Telescope (NVST) at the Fuxian Solar Observatory in China captured the entire evolution process of the sunspots during the flux emergence. Immediately after the flux emergence, the NVST TiO and Solar Dynamics Observatory (SDO)/Helioseismic and Magnetic Imager (HMI) images revealed that flux cancellation associated with δ sunspots formation occurred during the observation.
"The findings provided compelling evidence that tether-lengthening reconnection accompanying magnetic flux cancellation first triggered the blowout eruption and then continued to restructure the magnetic field for the reformation of the filament,” said Dr. YANG.
The study demonstrated previously proposed mechanisms for triggering of CME/flare eruptions and for the building of sheared fields in which filaments form.
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