Estimate of the Global Solar Radiation by Cloudy Sky Using HRV Images

AbstractA spectral model based on the ground atmosphere exchanges, modelled on the one hand by the satellite image processing and on the other hand by the absorption and the diffusion of the various atmospheric components. This model was implemented to evaluate the total flow of solar irradiation received on the ground; it was applied to data coming from Algerian sites by using images high resolution. These last are from SEVIRI sensor of the new generation satellite Meteosat (MSG), collected by the satellite in high-resolution visible channel (HRV-channel 12) [0,4 -1, 1μm] over four months (February-May 2012). The total flow of solar irradiation received on a horizontal surface, on the level of terrestrial surface, was then evaluated, on the scale of the hour. The results obtained were then compared with the solar data recorded on the ground in two stations: Dar El Beida and Adrar at the time of the same period of measurements. The coefficient of correlation between the radiances values resulting from modeling and those measured on the ground is 0.82. We show thus that the developed spectral analytical model describes the total flow of irradiation and it can be generalized with other sites, at larger periods