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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 18, issue 6
Ann. Geophys., 18, 618–628, 2000
https://doi.org/10.1007/s00585-000-0618-5
© European Geosciences Union 2000
Ann. Geophys., 18, 618–628, 2000
https://doi.org/10.1007/s00585-000-0618-5
© European Geosciences Union 2000

  30 Jun 2000

30 Jun 2000

Morphology of NmF2 nighttime increases in the Eurasian sector

A. V. Mikhailov1, T. Yu. Leschinskaya1, and M. Förster2,* A. V. Mikhailov et al.
  • 1Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation, Troitsk, Moscow Region 142092, Russia
  • e-mail: avm71@orc.ru
  • 2GeoForschungsZentrum, Projektbereich 2.3, Telegrafenberg, D-14473 Potsdam, Germany
  • Correspondence to: A. V. Mikhailov
  • *Present address: Max-Planck-Institut für extraterrestrische Physik, D-85740 Garching, Germany

Abstract. A statistical analysis of two peaks (pre-midnight and post-midnight) occurrence in NmF2 daily variations was made on a latitudinal chain of four ionosonde stations in the Eurasian longitudinal sector. Overall 6182 cases of the first and 5600 cases of the second peak occurrence were analyzed using all available foF2 observations for the years of solar maximum and minimum. Well-pronounced and systematic variations with season and solar activity were revealed in the occurrence probability of the peaks, their amplitude and timing. The pattern of both peaks occurrence is similar during winter and equinoxes for midlatitude stations implying one and the same mechanism of their formation. The pre-midnight summer peak shows specific variations in particular during solar maximum pointing to a different mechanism controlling its appearance. Possible mechanisms of both peaks formation are discussed.

Key words: Ionosphere (electric fields and currents; ionosphere-magnetosphere interactions; mid-latitude ionosphere)

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