HelioClim-1 Yearly Mean of Irradiance - Year 1997The HelioClim-1 database, abbreviated in HC-1, offers daily values of Surface Solar Irradiation (SSI) for the period 1985–2005. It has been created from archives of images of the Meteosat First Generation.This dataset provides for each year (1985-2005) a map of yearly mean of irradiance in (w/m2).