Solar Constant
The solar constant is a measure of the rate at which solar wave radiation is received at the rop of the atmosphere on a unit surface unit time.
It is customary to express the solar constant in terms of cal. cm2 min and a value of 1.94 or 1.95 cal cm2 /min has been generally accepted Recent measurements suggest that it might be slightly higher i.e. 2.0 cal/cm2/min and that there is some slight variability mainly because of fluctuations in the ultraviolet rays.
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