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28 March 2024 |
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Article overview
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Filament eruption in association with rotational motion near the filament footpoints | Sajal Kumar Dhara
; B. Ravindra
; Ravinder Kumar Banyal
; | Date: |
27 Jul 2013 | Abstract: | The active region magnetic field surrounding the filament plays an important
role in filament formation, their evolution and disruption. We investigated a
filament eruption that occurred in southern hemisphere of the Sun on July 08,
2011 using AIA and HMI data. The filament was located in a region close to the
active region NOAA 11247 with its West-most footpoint anchored in the negative
polarity plage region and the East-most in the positive polarity plage region.
During observations, the magnetic flux was emerging in the active region and
also in the plage regions. The flux emergence was stopped in West-most
footpoint of the plage region about an hour before the filament eruption. A
converging motion was also observed for many hours in the Western footpoint of
the filament. The filament had left-handed twist and the net injected magnetic
helicity was positive in both footpoints. Both sign of magnetic helicity were
observed in the Western footpoint of the filament where the eruption has
initiated. Further, an anti-clockwise rotational motion was observed in both
the footpoints just after the onset of filament eruption which lasted for 6 min
during the eruption process. The emerging flux, converging motion and injection
of opposite magnetic helicity could be responsible for destabilizing of the
Western footpoint of the filament leading to eruption. The torque imbalance
between the expanded portion of the flux tube and the photosphere may have
caused the rotation in the footpoint region which changed the trend in the
injected magnetic helicity after the filament eruption. | Source: | arXiv, 1307.7248 | Services: | Forum | Review | PDF | Favorites |
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