Atomic oxygen between 80 and 120 km - Evidence for a latitudinal variation in vertical transport near the mesopause

Details Atomic oxygen between 80 and 120 km - Evidence for a latitudinal variation in vertical transport near the mesopause Atomic oxygen between 80 and 120 km - Evidence for a latitudinal variation in vertical transport near the mesopause

Apr 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.1297w&link_type=abstract

Journal of Geophysical Research, vol. 84, Apr. 1, 1979, p. 1297-1309. NSF-supported research;

Physics

3

Mesopause, Nightglow, Oxygen Atoms, Satellite Observation, Transport Theory, Emission Spectra, Gas Density, Gas Flow, Meridional Flow, Ogo-6, Ozone, Reaction Kinetics, Spectrophotometry

Scientific paper

Analysis of the OGO 6 OI green line nightglow photometer experiment has been carried out for eight cases when the alignment of the spacecraft was such that local emission rates could be determined below the altitude of maximum emission and down to about 80 km. The results obtained show that the vertical gradient of the emission rate between 95 and 80 km alternates between regions of very rapid variation and very slow variation spaced on a scale of 5-10 deg of latitude. Maps showing isoemissivity contours and isodensity contours for atomic oxygen concentration in vertical meridional planes are presented. The densities are computed under three assumptions concerning excitation mechanisms. Comparisons of the vertical variations of oxygen density with the results of a time dependent theory suggest the regions of strong downward transport alternate in latitude with regions of weak transport near 90 km. In the first case, conversion of O to O3 at night appears to be overwhelmed by downward transport of O.

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