Statistics – Computation
Scientific paper
May 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975p%26ss...23..831c&link_type=abstract
Planetary and Space Science, vol. 23, May 1975, p. 831-842.
Statistics
Computation
1
Airglow, Conjugate Points, Earth Ionosphere, Electron Precipitation, Oxygen Spectra, Photoelectrons, Atomic Excitations, Computer Techniques, Electron Impact, Emission Spectra, Escape Velocity, Mathematical Models, Radiative Recombination
Scientific paper
Observations and computer calculations of O I 7774 A airglow emissions excited by conjugate photoelectrons have been carried out. The observations were made at McDonald Observatory, Texas using a 2 m grille spectrometer from December 1972 to June 1973. The zenithal emission intensity during conjugate photoelectron precipitation was fairly constant at 2-4 R until conjugate sunset, after which it diminished steadily and ceased near a conjugate solar zenith angle of 105 (plus or minus 3) deg. A predawn enhancement in both O I 7774 A and forbidden O I 6300 A was observed to commence near 102 deg. The computations utilize the two-stream technique of Nagy and Banks (1970) to obtain the escaping photoelectron flux and the local excitation rates of the oxygen emissions. Good agreement with the observations is obtained for the dependence of the emission rate on conjugate solar zenith angle.
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