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The second Hi-C flight (Hi-C2.1) provided unprecedentedly-high spatial andtemporal resolution ($\sim$250km, 4.4s) coronal EUV images of Fe IX/X emissionat 172 \AA, of AR 12712 on 29-May-2018, during 18:56:21-19:01:56 UT. Threemorphologically-different types (I: dot-like, II: loop-like, III:surge/jet-like) of fine-scale sudden-brightening events (tiny microflares) areseen within and at the ends of an arch filament system in the core of the AR.Although type Is (not reported before) resemble IRIS-bombs (in size, andbrightness wrt surroundings), our dot-like events are apparently much hotter,and shorter in span (70s). We complement the 5-minute-duration Hi-C2.1 datawith SDO/HMI magnetograms, SDO/AIA EUV images, and IRIS UV spectra and slit-jawimages to examine, at the sites of these events, brightenings and flows in thetransition-region and corona and evolution of magnetic flux in the photosphere.Most, if not all, of the events are seated at sites of opposite-polaritymagnetic flux convergence (sometimes driven by adjacent flux emergence),implying likely flux cancellation at the microflare's polarity inversion line.In the IRIS spectra and images, we find confirming evidence of field-alignedoutflow from brightenings at the ends of loops of the arch filament system. Intypes I and II the explosion is confined, while in type III the explosion isejective and drives jet-like outflow. The light-curves from Hi-C, AIA and IRISpeak nearly simultaneously for many of these events and none of the eventsdisplay a systematic cooling sequence as seen in typical coronal flares,suggesting that these tiny brightening-events havechromospheric/transition-region origin.

astrophysical journal/the astrophysical journal

Fine-scale explosive energy release at sites of prospective magnetic  flux cancellation in the core of the solar active region observed by Hi-C  2.1, IRIS and SDO