Physics
Scientific paper
Apr 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92.3367g&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 92, April 1, 1987, p. 3367-3374.
Physics
18
Atomic Excitations, Auroral Irradiation, Electron Precipitation, Energy Transfer, Molecular Ions, Satellite Observation, Electron Energy, Electron Impact, Intercosmos Satellites, Oxygen Atoms
Scientific paper
The emission rates of the O I 5577-A and the N2(+) 4278-A emissions and the flux of precipitating auroral electrons (in the energy range 200 eV to 15 keV) were observed by the Intercosmos Bulgaria 1300 satellite. Then, using the measured fluxes and atmospheric composition models, the emission rate ratio I(5577)/I(4278) for the N2(A) energy transfer mechanism was calculated. The modeled ratio compared well with the observed values, which varied from 2 to 5, with a few values outside this range. Assuming the N2(A) + O reaction as the dominant excitation mechanism, the ratio variation can be explained as arising from variations in O concentration, both with altitude and from day to day. Independent confirmation that atomic oxygen is the controlling variable for these observations, and that the N(2) + O is indeed the dominant O(1S) excitation process in aurora, was provided by the high correlation noted between the I(5577)/I(4278) ratios determined here and the O I(7320)/I(4278) ratios reported in the literature.
Gerdzhikova Mariann G.
Shepherd Gordon G.
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