Physics
Scientific paper
Jul 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jatp...44..559r&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 44, July 1982, p. 559-566.
Physics
1
Airglow, Oxygen Spectra, Thermosphere, Altitude, Reaction Kinetics
Scientific paper
Heights of peak volume emission rates of the (OI) 5577 A line (Z(C) and Z(B)) respectively predicted by Chapman (1931) and Barth (1964) have been worked out for different atomic oxygen density profiles in the lower thermosphere. These profiles were empirically derived adopting different values of peak oxygen densities, constant temperatures and mixing factors. It is found that Z(C) is only marginally higher than Z(m), and Z(C)-Z(m) does not vary significantly with any of these variable parameters. On the average Z(C)-Z(m) = 0.2 km, while Z(B) varies considerably with all these terms and is always lower than Z(m). The difference Z(m)-Z(B) is found to increase with T, the scale factor S which depends on the relative importance of mixing and diffusion in the altitude range of interest, and with O(m), varying from 1.0 to 3.6 km. For an average condition of T = 200 K, S = 0.7, and O(m) = 5 x 10 to the 11th per cu cm, Z(m)-Z(B) is about 2.2 km.
Chand Jain Vimal
Murty S. N. G.
Rao Mallikharjuna N.
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