Physics
Scientific paper
Dec 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81.6046r&link_type=abstract
Journal of Geophysical Research, vol. 81, Dec. 1, 1976, p. 6046-6058.
Physics
1
Auroral Spectroscopy, Emission Spectra, Gas Spectroscopy, Nitrogen, Spectrum Analysis, Vegard-Kaplan Bands, Electron Flux Density, Electron Impact, Molecular Excitation, Spectrophotometry
Scientific paper
Absolute auroral emission rates of several bands of the 1 PG (first positive), 2 PG, and Vegard-Kaplan systems of N2 and of the 1 NG (first negative) system of N2(+) were obtained from simultaneous spectral scans of two Ebert spectrophotometers mounted on board the NASA CV 990 aircraft. Analysis of these bands emitted during a 2-min auroral event leads to some conclusions regarding the excitation mechanisms of the C(3)Pi, B(3)Pi, and A(3)Sigma levels: the v' = 0 to v' = 3 levels of the C(3)Pi electronic state are populated by electron impact; the cross sections predict absolute emission rates that are in good agreement with the observations. Cross sections for excitation of the v' = 4 to v' = 8 levels, derived from laboratory measurement of the optical excitation functions, predict well the 1 PG bands observed in the auroral event.
Dick K. A.
Rees Manfred H.
Sivjee G. G.
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