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Summary

An anticorrelation ozone UV-B study at Punta Arenas and Ferraz, during October 1999, have shown that direct radiation is more correlated with total ozone than global radiation. The correlation is higher for measurements at a fixed solar zenith angle than for the daily maximum. It was observed also the use of a irradiance ratio improves the anticorrelation, by eliminating the common factors, no related to ozone, in different wavelengths. A depletion of 25% in total ozone implies in UV-B increases, at 305 nm, of 200% at Ferraz (solar zenith angle = 60^o) and 160% at Punta Arenas (solar zenith angle = 50^o).