Simultaneous observations of sporadic E, Na, Fe, and Ca+ layers at Urbana, Illinois: three case studies

C. S. Gardner, T. J. Kane, D. C. Senft, Qian Jun Qian, G. C. Papen

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On June 6-7, 1991, a sporadic Na layer and a prominent temperature inversion layer were observed near 90 km. The formation of this low-altitude event appears to involve the release of Na from a chemical reservoir or from the surfaces of dust and smoke particles, perhaps facilitated by the high temperatures in the inversion layer. On December 10, 1991, sporadic Fe and Ca+ layers formed near 94 and 95 km, respectively, and on December 17-18, 1991, sporadic E, Fe, Na, and Ca+ layers formed simultaneously near 100 km. The characteristics of these December events suggest that sporadic Fe and high-altitude sporadic Na layers are formed by the neutralization of Fe2+ and Na+ in the associated sporadic E layers. -from Authors

Original languageEnglish (US)
Pages (from-to)16,865-16,873
JournalJournal of Geophysical Research
Issue numberD9
StatePublished - Jan 1 1993

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

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