Continuum emission enhancements in solar flares observed by ROSA and IRIS.
Zuccarello F., Capparelli V., Mathioudakis M., Keys P., Prochazka O., Falco M., Murabito M.
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 (WL flare), probably due to energetic electrons heating directly the chromosphere and indirectly, through radiative backwarming, the photosphere. Recently the WL emission has been correlated with enhancements in the FUV and NUV passbands. We describe the results obtained from the analysis of data acquired by ground-based (ROSA@DST) and satellite (IRIS) instruments, concerning a WL flare, and the role played by the evolution of $\delta$ sunspots on flare triggering.