Daily Solar Irradiance from the Solar Mesospheric Explorer (SME) Ultraviolet Spectrometer

The solar spectrometer onboard the Solar Mesosphere Explorer (SME) measures ultraviolet radiation in the spectral range of 115.5 to 302.5 nm. Daily averages of solar irradiance, adjusted to a solar distance of 1 AU, with a spectral resolution of 1 nm is available on one tape. Improved solar Lyman-alpha flux at 120, 121, and 122 nm are included in the tape as a correction to the instrument's wavelength calibration error. The absolute flux is normalized to a rocket experiment of May 17, 1982 and is accurate to +/- 15%. The relative accuracy should not be considered better than +/- 2% per year, and extraction of long-term solar variability from this data set is not recommended by the investigators.