SORCE solar UV irradiance results

The Solar Radiation and Climate Experiment, SORCE, was launched in January 2003 and is now making the first comprehensive measurement of solar irradiance including both Total Solar Irradiance, TSI, together with spectral irradiance covering almost the entire electromagnetic spectrum of the Sun. The SORCE spectral observations extend from 0.1 to 2700 nm with only a portion of the EUV (35-115 nm) missing. Fortunately, the TIMED SEE instrument observes this missing EUV, and therefore, for the first time, the solar irradiance - both total and spectral - is being reported on a daily basis. This paper presents an overview of the SORCE spectral measurements with special emphasis on the UV and EUV (λ < 200 nm). These SORCE data are produced by the Solar Stellar Irradiance Comparison Experiment, SOLSTICE, and the XUV Photometer System, XPS, that are improved versions of first generation instruments aboard UARS and TIMED, respectively. The SORCE UV and EUV records of solar variations are presented and discussed. These data include important multi-wavelength observations taken during the solar storms in October-November 2003.