Physics
Scientific paper
May 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93.4060r&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 93, May 1, 1988, p. 4060-4066.
Physics
103
Aeronomy, Atmospheric Ionization, Extreme Ultraviolet Radiation, Ionization Cross Sections, Photoelectrons, Earth Ionosphere, Ion Production Rates, Nitrogen Ions, Oxygen Ions
Scientific paper
This paper presents calculations performed on the photoelectron impact to EUV photoionization rate ratios for atmospheric O, O2, and N2, and also for the production of N(+) by photodissociative ionization of N2. It was found that the ratios vary greatly with altitude. At high altitudes in the absence of photoelectron transport, the O(+) and N2(+) ionization rate ratios are about 0.35, but they increase with increasing optical depth; in the vicinity of the ionization peak, the photoelectron rate can exceed the EUV ionization rate for O(+) and N2(+). At high altitudes, the O2(+) ionization rate ratio is about half that of O(+); this ratio increases with increasing optical depth to reach a peak of about 0.4. There are also seasonal variations in the ratios at high altitudes depending on the magnitude of the conjugate photoelectron flux.
Richards Paul G.
Torr Douglas G.
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