Low energy enhancement of the OI 6300 A line and enhancement due to resonance excitation of the N2(+) First Negative bands

Details Low energy enhancement of the OI 6300 A line and enhancement due to resonance excitation of the N2(+) First Negative bands Low energy enhancement of the OI 6300 A line and enhancement due to resonance excitation of the N2(+) First Negative bands

Apr 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984angeo...2..191h&link_type=abstract

Annales Geophysicae (ISSN 0755-0685), vol. 2, Mar.-Apr. 1984, p. 191-195.

Physics

1

Auroral Zones, Molecular Excitation, Nitrogen Ions, Oxygen Spectra, Resonance Scattering, Visible Spectrum, Electron Precipitation, Energy Transfer, Infrared Spectra, Light Scattering, Line Spectra

Scientific paper

Low energy enhancement of the red auroral arc (OI 6300 A) and the N2(+) 1N (First Negative band) in the midday gap of the polar cleft is investigated. Maximum intensity of the emissions occurred at heights above 500 km. Optical data indicate that the arc is powered by electron precipitation (100 eV) occurring at high altitudes and conforming to the energy transfer process O + 2(D) + O(3P) - O(+ 4S) + O(1D). When the aurora is sunlit, the N2(+) 1N band emissions are enhanced and excited by resonance scattering of sunlight by N2(+) (X2 Sigma g +) ions. The observations showed no trace of (3.0), (4.1), and (5.2) N2(+) Meinel bands because of their low g-values. The associated enhancements of the red and blue emissions observed in the auroral zone are the result of the same process which characterizes the red aurora in the midday gap of the polar cleft. In the auroral zone, the low energy precipitation is generally merged with contributions of more energetic particles, making the red line enhancements less extreme.

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