Morning Overshoot of Te Enhanced by Downward Plasma Drift in the Equatorial Topside Ionosphere.

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  • Oyama K.-I.
    Institute of Space & Astronautical Science
  • Balan N.
    Institute of Space & Astronautical Science
  • Watanabe S.
    Department of Astronomy and Geophysics, Tohoku University
  • Takahashi T.
    Department of Astronomy and Geophysics, Tohoku University
  • Isoda F.
    Faculty of Education, Yokohama National University
  • Bailey G. J.
    Applied Mathematics Section, School of Mathematics, University of Shefeld
  • Oya H.
    Department of Astronomy and Geophysics, Tohoku University

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  • Morning Overshoot of Te Enhanced by Dow

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Abstract

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.

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