The frequency distribution of instantaneous insolation values

Extreme overirradiance events in São Paulo, Brazil

“…Overirradiance caused by cloud enhancement has been plenty discussed by many authors throughout the years (Antón et al, 2011;Emck and Ritcher, 2008;Gu et al, 2001;Hansen et al, 2010;Luoma et al, 2012;Piacentini et al, 2003Piacentini et al, , 2011Piedehierro et al, 2014;Suehrcke and McCormick, 1988;Tapakis and Charalambides, 2014;Weigl et al, 2012;Yordanov et al, 2013a,b), and the phenomenon is expected to be more intense at tropical latitudes in the Southern Hemisphere, at high plateaus and mountains (Yordanov et al, 2013b). Cloud enhancement has been traditionally related to reflection of sun radiation on the borders of Cumulus clouds around the sun disc, with the sun unobstructed.…”

Classification of daily solar radiation distributions using a mixture of Dirichlet distributions

“…These variations depend on the clouds size, speed and number. *corresponding author: ted.soubdhan@univ-ag.fr Studies of solar energy systems are traditionally performed using daily or hourly data [1], [2]. Such data do not take into account the fluctuations mentioned previously although it has been shown that the fractional time distribution for instantaneous radiation differs significantly from that obtained with daily values [3] [4].…”

Analysis of short-term solar radiation data

“…In addition, the variability of short-term radiation data and its effect on solar system performance have not been thoroughly investigated. One way to demonstrate the variability in solar radiation data is through frequency distributions as has been done by Suehrcke [1] and Gansler et al [2]. The distributions, and the solar radiation utilizability that depends on them, are investigated in this study.…”