Reevaluation of the O(+)(2P) reaction rate coefficients derived from Atmosphere Explorer C observations

Details Reevaluation of the O(+)(2P) reaction rate coefficients derived from Atmosphere Explorer C observations Reevaluation of the O(+)(2P) reaction rate coefficients derived from Atmosphere Explorer C observations

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9815589c&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A9, p. 15,589-15,597.

Physics

19

Atmospheric Chemistry, Atmospheric Composition, Photochemical Reactions, Reaction Kinetics, Electron Density (Concentration), Electron Transitions, Oxygen Atoms, Photoelectrons

Scientific paper

O(+)(2P) is an important species for studies of the ionosphere and thermosphere: its emission at 7320 A can be used as a diagnostic of the thermospheric atomic oxygen density. Unfortunately, there are no laboratory measurements of the O and N2 reaction rates which are needed to determine the major sinks of (O+)(2p). We have recalculated the O and N2 reaction rates for O(+) (2P) using recent improvements in the solar EUV flux, cross sections, and photoelectron fluxes. For the standard solar EUV flux, the new N2 reaction rate of 3.4 +/- 1.5 x 10 exp -10 cu cm/s is close to the value obtained by Rusch et al. (1977), but the new O reaction rate of 4.0 +/- 1.9 x 10 exp -10 cu cm/sec is about 8 times larger. These new reaction rates are derived using neutral densities, electron density, and solar EUV fluxes measured by Atmosphere Explorer C in 1974 during solar minimum. The new theoretical emission rates are in good agreement with the data for the two orbits studied by Rusch et al.

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