Abstract
A balloon-borne interference filter photometer designed to measure the OH band emission at 2 μm was flown from Fort Churchill, Canada, during the night of August 1–2, 1968. Observations of the intensity of the Q branch of the 8–6 band are presented and compared with results obtained with a 1.66 μm OH photometer carried in the same gondola. The morning and evening twilight variations observed are in agreement with those predicted by models based on mesospheric ozone photochemistry. The observed nighttime increase in the OH emission is not predicted by the theoretical models.
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