High-resolution auroral observations of the OI(7774) and OI(8446) multiplets

Details High-resolution auroral observations of the OI(7774) and OI(8446) multiplets High-resolution auroral observations of the OI(7774) and OI(8446) multiplets

Sep 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985georl..12..605h&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 12, Sept. 1985, p. 605-608.

Physics

27

Atmospheric Composition, Auroras, Electron Impact, Emission Spectra, Oxygen, Thermosphere, Fine Structure

Scientific paper

High resolution observations of the OI(7774) and OI(8446) multiplet auroral emissions were made using a Fabry-Perot spectrometer at Churchill, Canada during March, 1984. The intensity of each of these lines, relative to N2(+) (4278) may depend on atmospheric composition. The OI(8446) emission linewidths are under 40 mA while the OI(7774) emission linewidths have two components; one narrow (about 40 mA) and one broad (about 275 mA). The broad to narrow intensity ratio increases with decreasing red to blue ratio. These results are consistent with electron impact excitation of O being the dominant source of both emissions at high altitudes. However, at lower thermospheric altitudes, dissociative excitation of O2 molecules may be an important source of OI(7774) emission.

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