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Photometric measurements of the O2 U.V. nightglow |
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| Authors: | J -C Gerard |
| Institution: | Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, CO 80302, U.S.A. |
| Abstract: | Measurements of the O2(A3Σ ? X3Σ) Herzberg system in the night airglow have been made with the ESRO TD-1 satellite in the wavelength range 2400–3100 A. The slant emission rate varies from 3.5 to 15 kR, indicating an irregular structure of the atomic oxygen near the turbopause. A statistical maximum intensity is found near the tropic in the winter hemisphere. The intensity profile is consistent with excitation by three-body recombination of oxygen atoms. The observed total emission rate can be accounted for by reasonable atomic oxygen densities and an O2(A3Σ) production efficiency of about 20% if quenching by N2 occurs at the rate deduced from laboratory and other airglow measurements. |
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