Physics
Scientific paper
Feb 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976georl...3...77m&link_type=abstract
Geophysical Research Letters, vol. 3, Feb. 1976, p. 77-80.
Physics
1
Annual Variations, Atmospheric Composition, Diurnal Variations, Explorer 51 Satellite, Oxygen, Abundance, Mass Spectroscopy, Photodissociation, Winter
Scientific paper
Mass-spectrometer measurements of O and N2, obtained with the Atmosphere Explorer-C satellite during December 1974 and January 1975, are used to derive the O2 concentration near 250 km from several ionization reactions. In order to separate temperature effects from diffusion effects, the measured O and inferred O2 concentrations are employed to determine, under the assumption of diffusive equilibrium, the O/N2 and O2/N2 ratios at 120 km. It is found that the latitudinal and diurnal variations in the O concentration at 120 km are consistent with previous results obtained with OGO 6 and that the O2 concentration in the Northern (winter) Hemisphere is about twice as high as that in the Southern (summer) Hemisphere. The possible importance of photodissociation in the diurnal O2 variations is discussed.
Bauer Paul
Brace Larry H.
Brinton Henry C.
Mayr Hans G.
Potter W. E.
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