Clear perspective on the triggering mechanism of the filament eruption onset and the formation mechanism of filament is revealed, according to a new research published on The Astrophysical Journal. Dr. YANG Bo, from Yunnan Observatories, Chinese Academy of Sciences (CAS), is the lead author of the research.
The researcher study in detail the eruption and then reformation of a filament caused by a newly emerging magnetic flux, which emerged close to the negative ends of the filament in NOAA AR 11791 on 2013 July 15.
YANG found unambiguous solid observational evidences indicating that multiple interactions occurred between the emerging magnetic fields and the coronal loops overlying the filament. Meanwhile, a remarkable sigmoid structure was formed and lifted up together with the filament, and they finally erupted together and produced a 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 captured the entire evolution process of the sunspots during the Flux emergence. Followed by the flux emergence, the NVST TiO and SDO/HMI images reveal that flux cancellation associated with δ sunspots formation occurred during the observation.
"These observations provide 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”, Dr. YANG said, “The observations thus nicely demonstrate previously proposed mechanisms for triggering of CME/flare eruptions and for the building of sheared fields in which filaments form”.
This work is supported by the Natural Science Foundation of China; the CAS “Light of West China” Program and the Open Research Program of the Key Laboratory of Solar Activity of Chinese Academy of Sciences.
Contact:
YANG Bo, YNAO, CAS
boyang@ynao.ac.cn
