5. Calibration & Monitoring

Fig. 5-1
Calibration concept for SCIAMACHY. The final calibrated Earth radiance spectra are obtained by applying several calibration steps to the measured Earthshine signals. They include in-flight calibration measurements (red), on-ground measurements performed under thermal vacuum conditions (green), and component measurements from on-ground ambient tests (blue). The optical performance monitoring (red) provides addi-tional corrections. (Courtesy: SRON)
Fig. 5-2
Memory effect for channel 3. Yellow crosses mark the in-flight measurement of the memory effect. The blue solid line is a spline fit through the measurements that is used for the correction. (Courtesy: SRON)
Fig. 5-3
Non-linearity in channel 8 for different pixel regions (indicated by colours). 'Low' pixels are those with pixel numbers below 512. The pixel numbering starts at 0. (Courtesy: SRON)
Fig. 5-4
q (blue) and u (red) sensitivity from (5-13) for nadir (elevation angle of 61° top) and for limb (elevation angle of 11.4° and azimuth angle of 39°, bottom) for channels 1-5. Note that these sensitivities are multiplied with the polarisation fractions to get cpol and the correction will thus be smaller than displayed for lower polarisation. (Courtesy: SRON)
Fig. 5-5
Definition of the nadir coordinate frame used in the output of the data processor for polarisation values q = Q/I, u = U/I. (Courtesy: DLR-IMF)
Fig. 5-6
Schematic view of SCIAMACHY light paths used in performance monitoring. (Courtesy: IUP-IFE, University of Bremen)


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