Martínez-Chico, M.; Batlles, F.J.; Bosch, J.L. - In: Energy 36 (2011) 7, pp. 4055-4062
as the earth’s geometry, terrain, and atmospheric attenuation by gases, particles and clouds. Among these factors, it is … clouds present in the sky is therefore necessary to analyse both their attenuation levels and the prevalence of different sky … conditions. Cloud cover is characterised according to attenuation levels, using the beam transmittance (kb, ratio of direct …