A new interpretation of the 1304 Å triplet airglow intensity ratio with the fine structure levels in local thermodynamic equilibrium |
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Authors: | Toshihiro Ogawa |
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Institution: | Geophysics Research Laboratory, University of Tokyo, Bunkyo-ku, Tokyo 113, Japan |
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Abstract: | The intensity ratios of the 1304 Å triplet airglow of atomic oxygen observed by Fastie and Crosswhite (1964) are interpreted on the basis of the radiative transfer formulation for a model with complete frequency redistribution in a Voigt line profile. A model for the fine structure levels in local thermodynamic equilibrium is favorable to the observed intensity ratios, as far as a Voigt profile is applicable. In view of large cross sections as calculated theoretically by Allison and Burke (1969), the mutual relaxation among the 3Pj levels should occur rapidly enough to allow the population in the 3Pj levels to be in thermodynamic equilibrium with the ambient neutral gases. |
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