OI 7774 A and 8446 A emissions from night-side and midday cusp auroras

Details OI 7774 A and 8446 A emissions from night-side and midday cusp auroras OI 7774 A and 8446 A emissions from night-side and midday cusp auroras

Aug 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984angeo...2..463s&link_type=abstract

Annales Geophysicae (ISSN 0755-0685), vol. 2, July-Aug. 1984, p. 463-466.

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3

Auroral Spectroscopy, Cusps, Nightglow, Oxygen Spectra, Atomic Energy Levels, Dissociation, Optical Emission Spectroscopy

Scientific paper

In night time auroras, wherein precipitating particles dissipate most of their energy in the E region of the atmosphere, the ratio OI (844.6 nm)/OI (777.4 nm) is around 1. On the other hand, in midday cusp auroras, where optical emissions peak in the F region, the same ratio takes values between 3 and 5. These results suggest that in relatively low altitude nighttime auroras OI (777.4 nm) is excited both by electron impact on O and by an additional mechanism such as dissociative excitation of O2, the higher altitude midday cusp auroral measurements are consistent with e + O excitation of both OI multiplets.

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