OMI level-2 data are effected by residual errors in the dark current correction of the level-1b radiance and irradiance products that manifest as along-track stripes in the level-2 products. The largest source of striping is the irradiance. Using a composite solar spectrum in lieu of individual irradiance measurements for level 1-to-2 processing can significantly reduce the stripes.
This page provides composite solar spectra for all three OMI channels, derived either from the median or from a principal component analysis of the individual irradiances, and separated into pre- and post-OPF v25 (orbit 06551 and later). The individual spectra have been wavelength calibrated and then interpolated to a common wavelength grid of 0.01nm spacing. Data are provided in bzip2-compressed ASCII format and can be found here:
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Solar Composite Data |
Also available are an IDL routine for reading the ASCII files
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omi_solarcomposite_read.pro |
and a number of bzip2-compressed Postscript files with plots of
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Solar Composite Spectra and |
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Differences Between Solar Composite Spectra |
Please consult the "000README" files in each directory for details of file contents and naming conventions.
Finally, here is a sample image of an OMI composite solar
spectrum (click on the image below to open a PNG file with
the plot):
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