Vertical column abundance of atmospheric OH at solar maximum from Fritz Peak, Colorado

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Atmospheric Chemistry, Hydroxyl Radicals, Solar Activity Effects, Solar Cycles, Sunspots, Vertical Distribution, Abundance, Annual Variations, Atmospheric Composition, Colorado, Correlation Detection, Maxima

Scientific paper

New measurements of the vertical column abundance of atmospheric hydroxyl have been taken at Fritz Peak Observatory, Colorado, through the period of maximum solar activity of Solar Cycle 21. The OH abundance increase of about 12%/year observed since 1976 ended with the peak solar activity in 1980. The overhead-sun column abundance increased from 5.4 x 10 to the 13th/sq cm in 1977 to 9.5 x 10 to the 13th/sq cm in 1980. The 1981 observations show a subsequent average decrease of about 3%. The seasonal average abundances for the entire 1976-1981 period show a good linear correlation with the corresponding sunspot number averages. A high-sun enhancement of about 2 x 10 to the 13th/sq cm occurred during the 1979-1980 period; the resulting steep sec chi-distribution has persisted into 1981.

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