Dipartimento di Fisica e Astronomia – Università degli Studi di Catania, Italy
Natural Sciences (Astrophysics and Astrononmy)
During solar flares, magnetic energy can be converted into electromagnetic radiation from radio waves to gamma rays. In the most energetic events, enhancements in the continuum at visible wavelengths may be present (white-light [WL] flares). Recently, the WL emission has also been correlated with enhancements in the FUV and NUV passbands. In this context, we describe observations acquired by ground-based (ROSA@DST) and satellite (IRIS) instruments during two consecutive C7.0 and X1.6 flares occurred in active region NOAA 12205 on 2014 November 7.
The results of the analysis of these data show the presence of continuum enhancements during the evolution of the events, observed both in ROSA images and in IRIS spectra. Moreover, we analyze the role played by the evolution of the δ sunspots of the active region in the flare triggering, discussing the disappearance of a large portion of penumbra around these sunspots as a further consequence of these energetic flares. We expect that high-resolution observations acquired during the EST operations will enable us to extend our knowledge about the physical process that determines WL emission during solar events like those discussed here.
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