Abstract
ABSTRACT Atmospheric extinction coefficients in the U, B, V bands have been measured at McDonald Observatory on 382 nights covering the 20-year period December 1960 to December 1980. Analyses of these data characterize the natural levels and variations in atmospheric extinction during both perturbed (Mount Agung eruption) and unperturbed times. The need for nightly extinction measurements is clearly shown. No significant long-term trends were found. Power spectrum analysis shows only the sinusoidal seasonal variation with minimum extinction in January.
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