The altitude dependence of the OH(X2Pi) vibrational distribution in the nightglow - Some model expectations

Physics – Atomic Physics

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Hydroxyl Radicals, Molecular Excitation, Nightglow, Upper Atmosphere, Vibrational Spectra, Molecular Collisions, Quenching (Atomic Physics), Spectral Energy Distribution, Transition Probabilities

Scientific paper

A number of different OH Meinel band excitation models are used to investigate the extent to which quenching and vibrational deactivation processes could cause the nightglow OH vibrational distributions to vary with altitude. The various models, which are based upon those described by McDade and Llewellyn (1988), are used to calculate the steady state OH vibrational distributions throughout the 80-100 km region. The results of the calculation show that, irrespective of the basic model assumptions, the OH vibrational distributions should not be strongly altitude dependent and that the emission profiles of the Meinel bands from the prime levels 1 through 9 should not differ in altitude by more than one or two kilometers.

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