There are hot pixels (i.e. dead pixels) on the CCDs as expected. This will be most noticable in the raster data since the same part of the CCD will be used to build up the image. The attached image shows you the how pixels which are see are red streaks across the image. It s predicted that after a 10 year period the CCDs will have less than 5% hot pixels. The routine eis_prep aims to remove the hot pixels, and is working well. Hotpixels

The hot pixel co-ordinate files can be found in SSW (SSW\solarb\eis\data\cal\hp). These are updated monthly. The eis_prep routine uses these co-ordinate files.

--LouisaBradley, 19-Jul-2007