Articles | Volume 13
02 Feb 2016
 | 02 Feb 2016

On the effective solar zenith and azimuth angles to use with measurements of hourly irradiation

P. Blanc and L. Wald

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Cited articles

Blanc, P. and Wald, L.: The SG2 algorithm for a fast and accurate computation of the position of the Sun, Solar Energy, 86, 3072–3083,, 2012.
ESRA – European Solar Radiation Atlas: Fourth edition, includ. CD-ROM, edited by: Scharmer, K., Greif, J., Scientific advisors: Dogniaux, R., Page, J. K., Authors: Wald, L., Albuisson, M., Czeplak, G., Bourges, B., Aguiar, R., Lund, H., Joukoff, A., Terzenbach, U., Beyer, H. G., and Borisenko, E. P., published for the Commission of the European Communities by Presses de l'Ecole, Ecole des Mines de Paris, Paris, France, 2000.
Hall, I., Prairie, R., Anderson, H., and Boes, E.: Generation of Typical Meteorological Years for 26 SOLMET stations, SAND78-1601, Sandia National Laboratories, Albuquerque, 1978.
Kalogirou, S.: Generation of Typical Meteorological Year (TMY-2) for Nicosia, Cyprus, Renewable Energy, 28, 2317–2334,, 2003.
Korany, M., Boraiy, M., Eissa, Y., Aoun, Y., Abdel Wahab, M. M., Alfaro, S. C., Blanc, P., El-Metwally, M., Ghedira, H., Hungershoefer, K., and Wald, L.: A database of multi-year (2004–2010) quality-assured surface solar hourly irradiation measurements for the Egyptian territory, Earth Syst. Sci. Data Discuss., 8, 737–758,, 2015.
Short summary
Time series of hourly measurements or modelled values of surface solar irradiation are increasingly available. Currently, no solar zenith and azimuth angles are associated to each measurement whereas such angles are necessary for handling the measured or modelled irradiations. A method is proposed to assess such angles with a great accuracy. It makes use of two modelled time-series that can be computed using the web site for any site in the world.