OH vertical column abundances measured at Fritz Peak Observatory, Colorado, from 1977 through 1988 reveal semi‐annual and annual cycles which are amplitude modulated over the 11‐year data base. The modulation of the OH seasonal behavior is in phase with solar activity as described by the sunspot number index. No mechanism for the observed covariance of this OH behavior with solar activity has yet been identified.
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Burnett et al. (1989) studied this question.
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