Global solar radiation estimation using sunshine duration in Spain

摘要: Abstract Several equations were employed to estimate global solar radiation from sunshine hours for 16 meteorological stations in Spain, using only the relative duration of sunshine. These included original Angstrom–Prescott linear regression and modified functions (quadratic, third degree, logarithmic exponential functions). Estimated values compared with measured terms coefficient determination, standard error mean absolute error. All models fitted data adequately can be used hours. This study finds that degree performed better than other models, but model is preferred due its greater simplicity wider application. It also found seasonal partitioning does not significantly improve estimation radiation.