OMI Spectral Calibration Plots

The plots below show the spectral instrument stability for the whole mission duration for both radiance measurements and irradiance measurements via the quartz volume diffuser for the UV1, UV2 and VIS channels. For each radiance measurement a spectral calibration is performed for the central row (row 14 for UV1, row 29 for UV2 and VIS). In this fit the wavelength of each pixel in one row (viewing direction) is expanded in polynomial coefficients as a function of column number on the CCD detectors. The same fit is performed for each solar measurement, but in this case all available rows (viewing directions) are fitted. The 0th order coefficient of this polynomial fit is shown in the plots for the central nadir viewing direction (row 14 for UV1, row 29 for UV2 and VIS) in case of the radiance measurements. For the irradiance measurements the results are shown for rows 10, 30 and 50. This coefficient provides a view on the spectral instrument stability during the day. Per day one point is shown, representing the average of the spectral calibration results over that day.


Central Wavelength Shift for IcID 0 (EARTH_GLOBAL_TROPICS)




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Central Wavelength Shift for IcID 1 (EARTH_GLOBAL_MIDLAT)




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Central Wavelength Shift for IcID 2 (EARTH_GLOBAL_ARCTIC)




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Central Wavelength Shift for IcID 8 (SUN_VOLUME_GLOBAL) UV-1




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Central Wavelength Shift for IcID 8 (SUN_VOLUME_GLOBAL) UV-2




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Central Wavelength Shift for IcID 8 (SUN_VOLUME_GLOBAL) VIS




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