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), onground measurements performed under thermal vacuum conditions (green) and component measurements from onground ambient tests (blue). The optical performance monitoring (red) provides additional corrections. (graphics: 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. (graphics: 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. (graphics: SRON)
Fig. 5-4
q (blue) and u (red) sensitivity from equ. 5-6 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. (graphics: SRON)
Fig. 5-5
Definition of the coordinate frame used in the data processor for polarisation values q = Q/I, u = U/I. (graphics: DLR-IMF)
Fig. 5-6
Schematic view of SCIAMACHY light paths used in performance monitoring. (graphics: IUP-IFE, University of Bremen)
Fig. 5-7
Monitoring results for the nadir light path using measurements with the internal WLS in channel 2. All available data have been interpolated to a daily grid. (graphics: IUP-IFE, University of Bremen)
Fig. 5-8
As fig. 5-7, but results for channel 4. (graphics: IUP-IFE, University of Bremen)

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