Other
Scientific paper
Jun 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979georl...6..519v&link_type=abstract
Geophysical Research Letters, vol. 6, June 1979, p. 519-522.
Other
2
Atmospheric Ionization, Ionization Cross Sections, Oxygen Ions, Photoionization, Thermosphere, Explorer 51 Satellite, Ion Charge, Ion Production Rates, Ion Sources, Vertical Distribution
Scientific paper
It is shown that a plausible cross section for the double photoionization of oxygen at wavelengths less than 254 A accounts for the observed concentration of O(2+) ions in the thermosphere. Due to the lack of laboratory measurements, double ionization cross sections for atomic oxygen were estimated from laboratory measurements of the ionization cross sections of other species. For altitudes between 150 and 400 km, where O(2+) is assumed to be in photochemical equilibrium, calculations reveal a significantly greater contribution to O(2+) production by double ionization of O atoms than by single ionization of O(+) ions. The concentration of O(2+) ions, assuming a double photoionization creation mechanism and a large sink by charge exchange with molecular nitrogen, is calculated to agree with that measured by AE-C down to altitudes of 250 km.
Constantinides E. R.
Victor G. A.
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