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Abstract
Measurements at a high mountain station on cloudless days showed significant changes in solar radiation from summer 1991 to summer 1992 as a consequence of the Pinatubo eruption. An increase in diffuse sky total radiation and a concomitant decrease in global total radiation (sun and sky) of 4% were observed. The optical aerosol depth at 427 nm, obtained from sun photometric measurements, showed a significant increase.
