Abstract
AbstractA statistical relationship between the measured daily flux of short‐wave radiation, the extra‐terrestrial radiation and the duration of bright sunshine was established. Used were continuous daily data from the Weather Service station of Göttingen, West Germany (51°33′N, 9°57′E) for the period 1969–1980. The analysis was similar to the procedure proposed by Kimball (1927). Daily values for the extra‐terrestrial short‐wave radiation and for the maximum possible duration of sunshine were calculated from expressions developed by Swift (1976). It was found that in Göttingen, for an assumed solar constant radiative flux of 1352 W.m−2, the constants A and B in the Kimball equation were 0.18 and 0.47. It was also found that these average values varied from year to year and also for different seasons of the year. It is pointed out that if radiation values calculated with the Kimball equation are used to estimate the daily evapotranspiration, care must be taken that proper regional constants are used.
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