Observations of O₂ (¹Σ) and OH nightglow during the ALOHA‐90 Campaign

Two spectroscopic instruments, a 1/4 meter Ebert‐Fastie spectrometer and a Michelson interferometer, were flown aboard the NCAR Electra during the ALOHA‐90 campaign. These instruments were designed to carry out measurements of the brightnesses and rotational temperatures of the O 2 Atmospheric (0–1) band and several OH Meinel bands simultaneously with sodium lidar observations. The spectrometer results taken during the nights of March 25 and March 31 are reported. Wave‐like oscillations in both O 2 and OH airglow brightnesses were clearly present during both flights and a strong positive correlation of OH band brightness with sodium column density was found. A slightly weaker correlation of O 2 band brightness with sodium column density was also detected. The measured brightness ratio between the OH (7–4) and (7–3) bands is found to be 11.2±0.3, which is in good agreement with the calculated ratios of 12.8 by Mies [1974] and 10.2 by Langhoff et al. [1986].