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4 November 2004 In-orbit detection of spectral features in SCIAMACHY
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Abstract
Spectral oscillation features originating from the on-board diffuser in the spectra of the SCIAMACHY instrument on ENVISAT have been observed in instrument data. These spectral diffuser surface interference features are observed in the daily sun-over-diffuser calibration measurements (solar irradiance). The effect may hamper the analysis of atmospheric trace gases. Diffuser spectral features were already known from the on-ground calibration phase, which led to the implementation of a second diffuser in SCIAMACHY to reduce the features magnitude. Spectral features like these have already been observed at TNO TPD during the on-ground calibration for instruments that utilise on-board diffusers (i.e. GOME-2, OMI). Analysis of the characteristics of the features indicates different types, where at least one type shows a pattern typical for speckles. In addition a separation method of the different features present in the spectrum will be described.
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Berit Ahlers, Gregory Bazalgette Courreges-Lacoste, Coen Schrijvers, and Hedser van Brug "In-orbit detection of spectral features in SCIAMACHY", Proc. SPIE 5570, Sensors, Systems, and Next-Generation Satellites VIII, (4 November 2004); https://doi.org/10.1117/12.565565
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