This AR had a small sunspot that passed the central meridian around 16 UT on 5-Oct-2015.There was a problem with the EIS planning tool at this time which led to offsets between the requested pointing and the actual pointing. The pointings are about 30-40" north of where they should be so the sunspot appears at the bottom of the EIS rasters.
IRIS: 07:55-10:55, 21 rasters
EIS: 06:23-09:50, 31 rasters
There's a nice sunspot plume visible in the EIS data (see images below), but the IRIS
pointing is offset to the east of the sunspot. The plume is thus at the
right-hand edge of the IRIS raster (see image below), so we may not be
seeing the base. O
IV is clearly red-shifted in the plume.