One minute k_b and k_d probability density distributions Conditioned to the optical air mass

摘要

In this work we have analysed and modelled one-minute probability distribution function of solar direct and diffuse irradiance conditioned on the optical air mass. For this purpose, we have used one-minute data acquired in a radiometric station located in southeastern Spain (37.13°N, 3.63°W, 687 m a.m.s.l.). The study has been made over the dimensionless indices k_b and k_d. We have found marked bimodality in the k_b distribution function and asymmetry associated with the unimodal function of one-minute k_d values.