Analysis of Atmospheric Variables Influence on the Surface Global Solar Irradiation

The current national energy scenery indicates the need of clean and renewable energy sources applications. Then, it is necessary to study the renewable energy resources and their variability. Therefore, the article aims at studying the influence of atmospheric aerosols and precipitable water in the global solar irradiation at the surface. Stochastic models were developed to compar the ratio betweenthe global solar irradiation at the surface and at the top of the atmosphere (Kt) with the atmospheric variables by using data acquired at the Southern Space Observatory, located in the Brazilian Southern region. Only clear sky days were used. After data validation, it was observed that the developed models have presented low statistical deviations, however, there was significant improvement in the estimates provided by the one that used as input variables the transmittances associated with atmospheric aerosols and Rayleigh scattering, and vapor water absorptivity.