Morning overshootof Te enhanced by downward plasma drift in the equatorial topside ionosphere

K. I. Oyama, N. Balan, S. Watanabe, T. Takahashi, F. Isoda, G. J. Bailey, H. Ova

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41 Citations (Scopus)


The morning overshoot in electron temperature, Te, which occurs in the sunlit atmosphere of low electron density during early morning hours, is a well known phenomenon. Studies of the phenomenon carried out using the Hinotori satellite observations reveal that the overshoot enhances in the topside equatorial F-region for a short period of time in the morning. The enhancement in the overshoot is found to depend on season and solar activity; it is strong during the northern summer months and grows with the increase in solar activity. Theoretical model calculations show that the enhancement in Te is caused by a reduction in electron density in the topside ionosphere due to a downward drift of plasma.

Original languageEnglish
Pages (from-to)959-966
Number of pages8
JournalJournal of geomagnetism and geoelectricity
Issue number7
Publication statusPublished - 1996

All Science Journal Classification (ASJC) codes

  • Environmental Science(all)
  • Earth and Planetary Sciences(all)


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