ICID 63 => DARK_SUN_VOLUME_SPECTRAL

Illumination:

  • Dark (background) measurements corresponding to sun irradiance (quartz volume reflection diffuser) measurements of ICID 62.

Purpose:

  • Spectral zoom-in dark (background) measurements corresponding to sun light measurements.

Location:

  • Near the north pole, first light measurements, then dark measurements.

Usage:

  • Launch and Early Operations Phase (LEOP). Not used after 22 September 2004 (orbit 1007).

Description:

Dark (background) measurements with the exact same instrument settings as the SUN_VOLUME_SPECTRAL light measurement of ICID 62. The dark (background) measurements are performed near the north pole directly after the sun light measurements with the Sun Aperture Mechanism (SAM) closed and with the Folding Mirror Mechanism (FMM) in the position that blocks all Earth light. The dark (background) measurements are eventually used to correct the light measurements in the 0-1 data processing.