The Down-welling Short-wave Radiation (DSR) flux (W.m-2) at the surface level represents the short-wave fraction of the solar irradiance (0.3 - 4 µm) reaching the soil surface. DSR primarily determines the proportion of solar energy that can be potentially absorbed by the surface. DSR depends essentially on solar geometry and cloudiness.

The DSR is derived from many sensors (METEOSAT, MSG) using various approaches, in the framework of the projects :
  GEOLAND
  AMMA