Two-Stage Evolution of an Extended C-Class Eruptive Flaring Activity from Sigmoid Active Region NOAA 12734: SDO and Udaipur-CALLISTO Observations.
In: Solar Physics, Jg. 296 (2021-06-01), Heft 6, S. 1-25
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Zugriff:
In this article, we present a multi-wavelength investigation of a C-class flaring activity that occurred in the active region NOAA 12734 on 8 March 2019. The investigation utilizes data from the Atmospheric Imaging Assembly (AIA) and the Helioseismic Magnetic Imager (HMI) on board the Solar Dynamics Observatory (SDO) and the Udaipur-CALLISTO solar radio spectrograph of the Physical Research Laboratory. This low intensity C1.3 event is characterized by typical features of a long-duration event (LDE), viz. extended flare arcade, large-scale two-ribbon structures and twin coronal dimmings. The eruptive event occurred in a coronal sigmoid and displayed two distinct stages of energy release, manifested in terms of temporal and spatial evolution. The formation of twin-dimming regions are consistent with the eruption of a large flux rope with footpoints lying in the western and eastern edges of the coronal sigmoid. The metric radio observations obtained from Udaipur-CALLISTO reveals a broad-band (≈ 50 – 180 MHz ), stationary plasma emission for ≈ 7 min during the second stage of the flaring activity that resemble a type IV radio burst. A type III decametre-hectometre radio bursts with starting frequency of ≈ 2.5 MHz precedes the stationary type IV burst observed by Udaipur-CALLISTO by ≈ 5 min . The synthesis of multi-wavelength observations and non-linear force-free field (NLFFF) coronal modeling together with magnetic decay index analysis suggest that the sigmoid flux rope underwent a zipping-like uprooting from its western to eastern footpoints in response to the overlying asymmetric magnetic field confinement. The asymmetrical eruption of the flux rope also accounts for the observed large-scale structures viz. apparent eastward shift of flare ribbons and post-flare loops along the polarity inversion line (PIL), and provides evidence for lateral progression of magnetic reconnection site as the eruption proceeds. [ABSTRACT FROM AUTHOR]
Titel: |
Two-Stage Evolution of an Extended C-Class Eruptive Flaring Activity from Sigmoid Active Region NOAA 12734: SDO and Udaipur-CALLISTO Observations.
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Autor/in / Beteiligte Person: | Joshi, Bhuwan ; Mitra, Prabir K. ; Bhattacharyya, R. ; Upadhyay, Kushagra ; Oberoi, Divya ; Raja, K. Sasikumar ; Monstein, Christian |
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Zeitschrift: | Solar Physics, Jg. 296 (2021-06-01), Heft 6, S. 1-25 |
Veröffentlichung: | 2021 |
Medientyp: | academicJournal |
ISSN: | 0038-0938 (print) |
DOI: | 10.1007/s11207-021-01820-6 |
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