Fractal Classification of Solar Irradiances Into Typical Days Using a Cumulative Distribution Function

Abstract

In a view to reduce a long time series of several variables into typical days we present in this paper a method for classification of global irradiance days according to different weather classes. To do it we have used the fractal dimension as a basic criterion in the classification. The method which defines fractal dimensions thresholds using the cumulative function leads to classify the days of two Algerian sites into 3 classes : clear sky day, partially clouded sky day and clouded sky day.