including aerosol optical depth improves existing models for the retrieval in cloud-free conditions of the direct normal from the measured global irradiance in Egypt

Citation:
Boraiy, M., M. Korany, Y. Aoun, S. C. Alfaro, M. El-Metwally, A. M. M. Wahab, P. Blanc, Y. Eissa, H. Ghedira, G. Siour, et al., "including aerosol optical depth improves existing models for the retrieval in cloud-free conditions of the direct normal from the measured global irradiance in Egypt", Meteorologische Zeitschrift, 2017.