Vibrational enhancement and the excitation of N2/+/ and the first negative system in the high-altitude red aurora and the dayside cusp

Details Vibrational enhancement and the excitation of N2/+/ and the first negative system in the high-altitude red aurora and the dayside cusp Vibrational enhancement and the excitation of N2/+/ and the first negative system in the high-altitude red aurora and the dayside cusp

Dec 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....8611372d&link_type=abstract

Journal of Geophysical Research, vol. 86, Dec. 1, 1981, p. 11372-11378.

Physics

12

Electron Impact, Gas Ionization, High Altitude Environments, Nitrogen Ions, Red Arcs, Vibrational Spectra, Atmospheric Models, Daytime, Electron-Ion Recombination, Fluorescence, Gas-Ion Interactions

Scientific paper

Broadfoot's (1967) theory for the fluorescent scattering of sunlight by N2(+) in high-altitude auroral rays is updated with new radiative and electron impact cross sections and extended to include the analogous process of fluorescence induced by low-energy electrons. The two mechanisms successfully account for the observed vibrational enhancement of the first negative system in both the sunlit and non-sunlit phases of the great type-A red aurora of Feb. 10, 1958, without recourse to proton precipitation as has commonly been suggested. They also permit a number of conclusions to be drawn regarding vibrational temperatures, ion lifetimes, and the role of electron fluxes. It is noted that in the cusp the agreement is not very conclusive as yet, although a recently published single set of data suggests that the cusp was totally sunlit at the time. Recalculated g-values for solar scattering and corresponding arrays of band intensities of the first negative and Meinel systems are presented. It is noted that laboratory beam parameters often lie well within the range of the model prediction, suggesting a means of controlled study of the proposed electron-induced fluorescence mechanism.

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