Authors: Harry P. Warren, John T. Mariska
Affiliation: Naval Research Laboratory
The Sun's extreme ultraviolet radiation (EUV, 50-1200 A) exerts a powerful influence on the Earth's upper atmosphere. Variations in solar EUV radiation drive significant changes in the density and ionization of the Earth's thermosphere and ionosphere. Measuring the solar EUV irradiance has proven difficult, however, and there are many discrepancies among the existing observations and the proxy models derived from them. We have developed an independent approach to modeling the solar irradiance using emission measure distributions and full-disk solar images. In this poster we will present a new reference spectrum for the EUV irradiance of the quiet Sun that is based on extensive observations from the CDS and SUMER spectrometers on SOHO as well as new compilations of atomic data. We will also present comparisons between the new model calculations and irradiance observations near solar minimum.