This work focuses on the variability of the global solar radiation over the area of Maceió (9°40′S, 35°42′W, 127m), located in Northeastern State of Alagoas, Brazil, during the1997–1999 period. Solar radiation variability was evaluated on 5min, hourly, daily, monthly and seasonal...

An empirical expression developed to estimate global solar radiation in clear days, on inclined surfaces located at any geographical position, is presented. This expression allows determining the global solar radiation in a specific day of the year, considering the attenuation of radiation in...

This paper aims at providing scientific evidence of the existence of a high potential of solar energy, not only for the application of flat photovoltaic installations, but also for tracking systems that use concentration, which promise to contribute towards lowering the cost of photovoltaics to...

The present work shows an analysis of ground measurements of Global Horizontal Irradiation (GHI) taken at the Doha International Airport for the period 2008–2012. Inter-annual variability and monthly averages of GHI values were calculated from the available records of daily total irradiation...

In this study, the global solar radiation on horizontal surface in Akure, Nigeria (Latitude 7.25° N and Longitude 5.2° E) using 22-year data (July 1983–June 2005) was analysed. Simple empirical correlations for evaluating the monthly average daily global solar radiation were developed. The...

The biological and photochemical effects of solar radiation and solar energy applications make it really important to characterize the variability of this component. In view of the fact that the clearness index indicates not only the level of availability of solar radiation but also the changes...

A long range five years (2001–2005) measured data of the global solar radiation on horizontal surface along with the bright sunshine hours of four prominent cities viz. Jodhpur, Calcutta, Bombay, and Pune of India have been analyzed. The under considered cities have varying weather conditions...

Measurements of UV (ultraviolet) and global solar radiation in Central China during 2006–2012 were first reported to investigate the UV radiation variability in different time scales and its UV fraction under different sky conditions. Both UV irradiation and UV fraction showed similar features...

A<b> </b>new short-term probabilistic forecasting method is proposed to predict the probability density function of the hourly active power generated by a photovoltaic system. Firstly, the probability density function of the hourly clearness index is forecasted making use of a Bayesian auto regressive...

Measurements of photosynthetically active radiation (PAR) and global solar radiation (G) at WHU, Central China during 2006–2011 were used to investigate the seasonal characteristics of PAR and PAR/G (PAR fraction). Both PAR and PAR fraction showed similar seasonal features that peaked in...