Study of the statistical indicators of global solar radiation in Algeria using the Angström model

Abstract

This study was conducted to estimate the monthly global solar radiation in the Algerian territory using the Angström model, for seven sites in Algeria, namely: Algiers, Ain Bessem, Constantine , Oran, Djelfa, Mascara, and Tamanrasset. The models are based on global solar radiation in the horizontal surface as well as sunshine hours . To evaluate the results obtained by the different sites we calculated the following relative average algebraic differences: MAE, MBE and RMSE The results show a remarkable agreement between the measured and computed values, especially in Tamanrasset site where the slope is of the order of 1