ICID 4 => DARK_GLOBAL_MIDLAT
- Dark (background) measurements corresponding to Earth radiance measurements of ICID 1.
- Global dark (background) measurements.
- Eclipse side of the orbit (2 blocks per orbit).
- From launch onwards, almost every orbit, except during spatial zoom-in measurement days and during Monthly 3 observational scenario (1 orbit per month).
Dark (background) measurements with the exact same instrument settings as the EARTH_GLOBAL_MIDLAT light measurement of ICID 1. The dark (background) measurements are performed at the eclipse side of the orbit in 2 blocks: just after the satellite has entered the eclipse side and just before the satellite will leave the eclipse side of the orbit. The dark (background) measurements are eventually used to correct the light measurements in the 0-1 data processing. These dark measurements do not use the folding mirror to block the Earth light.