Institut für Umweltphysik/Fernerkundung Physik/Elektrotechnik Fachbereich 1 stefan.noel@iup.physik.uni-bremen.de ENVIVAL-LIFE Meeting 6/7 Dec 2010 SCIAMACHY Degradation Monitoring Main method: –Ratio (calibrated) signal of well known source (sun above atmosphere, internal white light source (WLS)) at time t to corresponding measurement at reference time t 0 –Reference time for SCIAMACHY: 2 August 2002 (begin of nominal meas.) –Performed for different light paths, corresponding to different viewing geometries –Degradation correction factors (m-factors) are regularly produced and used in operational 1-2 processing (see: http://www.iup.uni-bremen.de/sciamachy/mfactors) Limitations: –No polarised light source available, therefore no monitoring of changing polarisation sensitivity possible –Scan angle dependent degradation correction in preparation
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