Example of an extended EUV brightening from region E. The top row plots the HRI_EUV intensity at five time-steps over the course of around 204 s. The EUV brightening activity is outlined by the cyan contours. The second row plots the co-spatial and co-temporal IRIS Mg II 279.6 nm filter SJI response (the dark spot in the centre of the images is a known blemish in the filter), while the third row plots the equivalent, but for the Si IV 140 nm filter. A clear brightening is evident in the Si IV 140 nm channel with a similar shape to, but extending slightly further to the south from, the EUV brightening in the HRI_EUV data. The bottom row plots the line-of-sight photospheric magnetic field at this location as sampled by the SDO/HMI instrument. An animation of this region is available online.