Observations of flare ribbons and their hooks in two X-class flares of July 12, 2012 and September 10, 2014. Panels a and b: context images observed in AIA 304 Å during the impulsive phases of each flare. Positive and negative polarity ribbons are labeled PR and NR respectively, and their respective hooks are labeled PRH and NRH. Panels c and d: zoom-ins of the NRH at three different times, shown by blue, green, and red colors, respectively. We note that in panel d, the IRIS/SJI 1400 Å images are shown rather than AIA 304 Å, due to their higher spatial resolution. Panels e and f: manually traced-out ribbon locations (dashed colored lines) at times corresponding to panels c and d.
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