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• W1991868899 abstract "Hourly measurements of solar radiation values in the intervals 295–385 nm, 285–2800 nm (Rs), and 695–2800 nm recorded simultaneously at the National Observatory of Athens from January 1990 to December 1992 have been utilized to determine the distribution of radiant energy in the visible (385–695 nm) region of the spectrum, which is often referred to as photosynthetically active radiation (RP). These data were used to evaluate the temporal variability of RP and its dependence on sky conditions and air pollution in Athens. The seasonal variation of the ratio RP/RS obtained from hourly data ranges from 0.419 (during Winter) to 0.446 (during Summer) with an annual mean value of 0.436. The ratio RP to RS increased from 0.428 to 0.444 (hourly values) as sky conditions changed from ‘sunny’ to ‘overcast’. The effect of air pollution on the ratio RP/RS does not seem to be noticeable in the present investigation." @default.
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• W1991868899 date "1996-11-01" @default.
• W1991868899 modified "2023-10-13" @default.
• W1991868899 title "Photosynthetically active radiation in Athens" @default.
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• W1991868899 doi "https://doi.org/10.1016/0168-1923(95)02290-2" @default.
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