Rocket observations of oxygen night airglows - Excitation mechanisms and oxygen atom concentration

Computer Science – Sound

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Nightglow, Oxygen Atoms, Oxygen Spectra, Rocket Sounding, Airglow, Reaction Kinetics, Recombination Reactions, Resonance Fluorescence, Sounding Rockets, Thermosphere, Vibrational Spectra

Scientific paper

The altitude profiles of oxygen night airglows were observed by rocket experiments. Simultaneous measurements of emission rates at three different bands of the O2 Herzberg I system, originating from higher, middle and lower vibrational levels of O2(A3Sigma(+)u), suggests that the vibrational distribution of O2(A3Sigma(+)u) is almost invariant in the night airglow and that it varies considerably in the rocket glow. This result is explained by a model for the excitation and de-excitation of the Herzberg I system, where O2(A3Sigma(+)u) is assumed to be excited directly in the three-body recombination of oxygen atoms and to be deexcited mainly due to collisions with atmospheric molecules. A possible range of the rate coefficients of the O2(A3Sigma(+)u) de-excitation is determined to be compatible with the observation. Based on the inferred excitation mechanisms, oxygen atom concentration is deduced from the observed emission rates of the Herzberg I bands.

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