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We study flare processes in the lower solar atmosphere using observationaldata for a M1-class flare of June 12, 2014, obtained by New Solar Telescope(NST/BBSO) and Helioseismic Magnetic Imager (HMI/SDO). The main goal is tounderstand triggers and manifestations of the flare energy release in the lowerlayers of the solar atmosphere (the photosphere and chromosphere) usinghigh-resolution optical observations and magnetic field measurements. Weanalyze optical images, HMI Dopplergrams and vector magnetograms, and useNon-Linear Force-Free Field (NLFFF) extrapolations for reconstruction of themagnetic topology. The NLFFF modelling reveals interaction of oppositelydirected magnetic flux-tubes in the PIL. These two interacting magnetic fluxtubes are observed as a compact sheared arcade along the PIL in thehigh-resolution broad-band continuum images from NST. In the vicinity of thePIL, the NST H alpha observations reveal formation of a thin three-ribbonstructure corresponding to the small-scale photospheric magnetic arcade.Presented observational results evidence in favor of location of the primaryenergy release site in the dense chromosphere where plasma is partially ionizedin the region of strong electric currents concentrated near the polarityinversion line. Magnetic reconnection may be triggered by two interactingmagnetic flux tubes with forming current sheet elongated along the PIL.

Observational Investigation of Energy Release in the Lower Solar Atmosphere of a Solar Flare