Temporal evolution in the blue and red wings of the Hα line profile. (Top row) Evolution of this event through time (from 17:29:42 UT to 17:35:35 UT) in the blue wing (each frame is separated by approximately 70 s). (Bottom row) Corresponding FOV and frames in the red wing showing the apparent parabolic trajectory of this event. The white line indicates an artificial slit used to enable a time-distance plot (shown in Fig. 3).