The ultraviolet dayglow at solar maximum. III - Photoelectron-excited emissions of N2 and O

Details The ultraviolet dayglow at solar maximum. III - Photoelectron-excited emissions of N2 and O The ultraviolet dayglow at solar maximum. III - Photoelectron-excited emissions of N2 and O

Jul 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90.6608m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 90, July 1, 1985, p. 6608-6616.

Physics

45

Dayglow, Nitrogen, Oxygen Spectra, Photoelectrons, Solar Spectra, Ultraviolet Spectra, Emission Spectra, Maxima, Particle Flux Density, Solar Cycles, Stellar Atmospheres, Stellar Models

Scientific paper

Rocket observations of the far ultraviolet dayglow spectrum near solar cycle maximum are analyzed using laboratory cross sections, atmospheric composition models, and photoelectron production models. Photoelectron-excited emissions of N2 and O are used to derive a self-consistent description of the atmosphere at solar maximum. Spectral synthesis of the N2 Lyman-Birge-Hopfield bands shows a departure of a 1Pi(q) state vibrational populations from the direct excitation theory. Observations of the N2 second positive (0, 0) 3371-A band and O I 1356-A emission indicate an exospheric temperature of 1600 K, 200 K higher than predicted by empirical models. The empirical models are also found to overestimate the O and O2 densities required to fit the data by a factor of 2 and 1.4, respectively. These results are compared to the results of an analysis of similar observations made in 1978 near solar minimum.

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