The molecular oxygen band systems in the U.V. nightglow - Measured and modelled

Details The molecular oxygen band systems in the U.V. nightglow - Measured and modelled The molecular oxygen band systems in the U.V. nightglow - Measured and modelled

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991p%26ss...39..595s&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 39, April 1991, p. 595-609. Research supported by NFR and Swedish National Sp

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25

Nightglow, Oxygen Spectra, Ultraviolet Radiation, Ultraviolet Spectra, Molecular Spectra, Spectral Bands, Vibrational Spectra

Scientific paper

High resolution, ground-based measurements of the near-ultraviolet portion of the terrestrial nightglow spectrum are analyzed using a nonlinear least-squares method to fit synthetic spectra of the Herzberg I, II, III and Chamberlain bands of O2. The presence of the Herzberg III system is not substantiated by the present measurements. The vibrational population distribution of the A 3Sigma-u(+) state is obtained and, partly based on some assumptions, the virbrational population distributions of the other two emitting states, (1Sigma-u/-/ and A-prime 3Delta-u) are determined. The total intensities of the three systems are obtained under varying geophysical conditions for about 80 nights distributed over almost half a solar cycle. The measured covariations of the Herzberg I and Herzberg II systems with simultaneously obtained green line intensities provide a set of quenching parameters for O2 (c 1Sigma-u/-/). These parameters set an upper limit of 10 percent on the production efficiency of O2 (c 1Sigma-u/-/) in the atomic oxygen association reaction and indicate that the ratio of quenching by O and O2 is much greater than 50:1.

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