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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 17, issue 7
Ann. Geophys., 17, 913–918, 1999
https://doi.org/10.1007/s00585-999-0913-8
© European Geosciences Union 1999
Ann. Geophys., 17, 913–918, 1999
https://doi.org/10.1007/s00585-999-0913-8
© European Geosciences Union 1999

  31 Jul 1999

31 Jul 1999

On the variability of I(7620 Å)/I(5577 Å) in low altitude aurora

E. J. Llewellyn1, R. L. Gattinger1, and A. Vallance Jones2 E. J. Llewellyn et al.
  • 1Institute of Space and Atmospheric Studies, Department of Physics and Engineering Physics, 116 Science Place, University of Saskatchewan, Saskatoon, SK S7N 5E2, Canada
  • E-mail: llewellyn@skisas.usask.ca
  • 2Canadian Space Agency, Ottawa, Canada

Abstract. An auroral electron excitation model, combined with simple equilibrium neutral and ion chemistry models, is used to investigate the optical emission processes and height profiles of I(5577 Å) and I(7620 Å) in the 90 to 100 km altitude region. It is shown that the apparent discrepancies between ground-based and rocket-borne auroral observations of the I(7620 Å)/I(5577 Å) ratio are due to the extreme height variation of this intensity ratio in the 90 to 100 km region.

Key words. Atmospheric composition and structure (airglow and aurora)

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