Horizontal plasma velocities measured with DAVE for two-hour time-series of 45-s HMI magnetograms depicting the four evolutionary stages of the region: a) 15:30−17:30 UT on July 17; b) 08:00−10:00 UT on July 18; c) 00:00−02:00 UT on July 19; and d) 21:30−23:30 UT on July 19. Color-coded vectors (best seen when zooming in in the on-line version, and red indicates a flow speed in excess of 0.4 km s-1) are superposed onto a time-averaged magnetogram covering the respective time-series.
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