Modeling of the N2(+) first negative bands in the sunlit aurora

Details Modeling of the N2(+) first negative bands in the sunlit aurora Modeling of the N2(+) first negative bands in the sunlit aurora

Aug 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987p%26ss...35.1061d&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 35, Aug. 1987, p. 1061-1066.

Other

1

Auroras, Molecular Ions, Nitrogen Ions, Solar Radiation, Fluorescence, Molecular Energy Levels, Positive Ions, Rayleigh Scattering, Vibrational Spectra

Scientific paper

The N2(+) First Negative band profiles in the high-altitude sunlit aurora are modeled by solving a set of simultaneous coupled equations for the population and depopulation of the N2(+) vibrational and rotational energy levels. Approximations due to computer processing time and the use of 1-A-averaged solar flux resulted in the loss of the Swings effect, but otherwise the modeled spectra simulate the observations and the characteristic high rotational development quite closely. Comparisons with the well-known spectrum of the 3914-A band in the sunlit auroral ray published by Hunten et al. (1959) give the N2(+) ion lifetime of about 1000 sec and N2 X rotational temperature of about 600 K, and are consistent with the fluorescent excitation mechanism; this contradicts conclusions made some two decades ago. A sample auroral cusp spectrum is included to illustrate the effects of Rayleigh scattering of solar flux.

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