Validation of the Surface Downwelling Solar Irradiance Estimates of the HelioClim-3 Database in Egypt. - Yehia Eissa; Mohamed Korany; Youva Aoun; Mohamed Boraiy; Magdy M. Abdel Wahab; Stephane C. Alfaro; Philippe Blanc; Mossad El-Metwally; Hosni Ghedira; Katja Hungershoefer; Lucien Wald (Remote. Sens., 2015)