a) A snapshot of the full 68′′ × 68′′ field-of-view captured through the Hα wideband filter. An expanded view of the flare region in Hαb) and Ca ii K core c) are also shown with sample positions for the time-distance slice method used in Sects. 3.1 and 3.2. A box is included in both image b) and c) to highlight one of the brightenings used to determine the horizontal bulk plasma velocities summarised in Table 1. A sample time-distance plot using the slice position indicated in c) is shown also d). The blue line shows the gradient used to establish the velocity.
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