Abstract
The frequency distribution of instantaneous terrestrial insolation
values based on measurements carried out over a one-year period has
been evaluated. The resulting fractional time distribution curves
for instantaneous radiation are found to differ from that obtained
previously for daily values. The instantaneous fractional time curves
exhibit a distinct step associated with the predominance of two radiation
states, clear and cloudy. A model derived from the concept of Boltzmann
statistics is shown to be in good agreement with the experimental
measurements over a wide range of air masses and average clearness
indices.
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