he validation of the SOLSTICE solar irradiances was a joint effort of four solar UV irradiance programs. The measurements of the solar ultraviolet spectral irradiance made by the two UARS solar instruments, SUSIM and SOLSTICE, are compared with same-day measurements by two other solar instruments on the Shuttle Atmospheric Laboratory for Applications and Science (ATLAS) missions, ATLAS SUSIM and Shuttle Solar Backscatter Ultraviolet (SSBUV) experiment.

        Measurements from the four instruments agree to better than the 2 sigma uncertainty of any one instrument, which is ± 5-10% for all wavelengths above the 160 nm, as well as for strong emission features below 160 nm. Additionally, the long-term relative accuracy of the two UARS data sets ifs better than the original 2% goal, especially at wavelengths greater than 160 nm. This level of agreement is credited to accurate pre-flight calibrations coupled with comprehensive in-flight calibrations to track instrument degradation.

        A detailed description of the SOLSTICE instrument validation is given by Woods et al. ("Validation of the UARS Solar Ultraviolet Irradiances: Comparison with the ATLAS-1, -2 Measurements", J. Geophys. Res., in press, 1996).

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