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Properties and Energetics of Magnetic Reconnection: I. Evolution of Flare Ribbons
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Properties and Energetics of Magnetic Reconnection: I. Evolution of Flare Ribbons
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Journal Article
Properties and Energetics of Magnetic Reconnection: I. Evolution of Flare Ribbons
2022
Overview
In this article, we measure the mean magnetic shear from the morphological evolution of flare ribbons, and examine the evolution of flare thermal and nonthermal X-ray emissions during the progress of flare reconnection. We analyze three eruptive flares and three confined flares ranging from GOES class C8.0 to M7.0. They exhibit two well-defined ribbons along the magnetic polarity-inversion line (PIL), and have been observed by the Atmospheric Imaging Assembly and the Ramaty High Energy Solar Spectroscopic Imager from the onset of the flare throughout the impulsive phase. The analysis confirms the strong-to-weak shear evolution in the core region of the flare, and the flare hard X-ray emission rises as the shear decreases. In eruptive flares, in this sample, significant nonthermal hard X-ray emission lags the ultraviolet emission from flare ribbons, and rises rapidly when the shear is modest. In all flares, we observe that the plasma temperature rises in the early phase when the flare ribbons rapidly spread along the PIL and the shear is high. We compare these results with prior studies, and discuss their implications, as well as complications, related to the physical mechanisms governing energy partition during flare reconnection.
Publisher
Springer Netherlands,Springer Nature B.V
