The International Standards Organization (ISO) is developing a solar irradi
ance standard to specify the representations of solar irradiances. It is ap
plicable to measurements, reference spectra, empirical models, and first-pr
inciples models. Its purpose is to provide a standard specification of all
solar irradiances for use by space systems materials and environment. The s
tandard development process, the participants and owners of that process, t
he scope, concept, assumptions underlying this particular standard, and the
ISO solar irradiance standard itself are described. (C) 2000 Elsevier Scie
nce Ltd. All rights reserved.