Light curves of the mean intensity around two regions of complex EUV brightening activity within regions F (left panel) and G (right panel). Again, the black lines plot light curves constructed from the HRI_EUV data, and the blue and red lines plot light curves constructed using the IRIS Mg II 279.6 nm and Si IV 140 nm SJI filters, respectively. The left panel plots the light curves constructed from a small box (similar to those discussed in Fig. 4) around the event plotted in Fig. 7. The HRI_EUV intensity is found to peak co-temporally with the increased emission in both IRIS SJI filters for the left panel. For the right panel, however, several short bursts (lifetimes of the order of seconds) are evident in the IRIS Si IV 140 nm intensity during the occurrence of the EUV brightening. The time defined as t = 0 s is overlaid on each panel.