Abstract
OH day and night airglow intensity variations were measured with a three-channel balloon-borne i.r. photometer in four separate flights from southern France in June 1970 and June 1971. The nightglow intensity showed a minimum at some time between midnight and 0200 hr local mean time followed by a steady increase until the end of the night. In all four flights a rapid pre-sunrise decrease in intensity was observed at a solar elevation of −6°. The dayglow intensities increased slowly after sunrise with the emission reaching half its pre-dawn value near a solar elevation of 36°. The morning twilight observations are compared with other observations and with theoretical predictions.
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