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
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
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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