Electron auroral excitation efficiencies and intensity ratios

Details Electron auroral excitation efficiencies and intensity ratios Electron auroral excitation efficiencies and intensity ratios

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....9510321s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, July 1, 1990, p. 10321-10336. Research supported by the University of

Computer Science

Sound

25

Atmospheric Composition, Auroral Arcs, Electron Flux Density, Electron Precipitation, Auroral Spectroscopy, Nitrogen Ions, Oxygen Ions, Satellite Sounding, Vertical Distribution

Scientific paper

Selected ground-based optical observations and satellite-borne electron measurements are analyzed to yield auroral excitation efficiencies of the O(1S) 5577 A and N2(+) first negative (0.1) 4278 A emissions. The findings for the 5577 A excitation efficiencies illustrate the variation that may be expected in this quantity for moderate levels of geomagnetic activity and auroral intensity and for typical keV electron characteristic energies. The magnetic zenith 6300/4278 column intensity ratio is observed to vary with the characteristic energy of the exciting electron influx in a given relation. The 5577/4278 ratio decreases from 5.4 to 3.3 as the characteristic energy increases from 1 to 5 keV.

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