Yonezawa, T. and Arima, Y. (1959) On the Seasonal and Non-Seasonal Annual Variations and the Semi-Annual Variation in the Noon and Midnight Electron Densities of the F2 Layer in Middle Latitudes. Journal of Radio ResearchLaboratory, 6, 293-309.

has been cited by the following article:

• TITLE: foF2 Seasonal Asymmetry Time Variation at Korhogo Station from 1992 to 2002

  AUTHORS: Karim Guibula, Frédéric Ouattara, Doua Allain Gnabahou

  KEYWORDS: Seasonal Asymmetry, Annual Asymmetry, Equinoctial Asymmetry, F2 Layer Critical Frequency, Time Variation

  JOURNAL NAME: International Journal of Geosciences, Vol.9 No.4, April 26, 2018

  ABSTRACT: foF2 seasonal asymmetry is investigated at Korhogo station from 1992 to 2002. We show that equinoctial asymmetry is less pronounced and somwhere is absent trough out solar cycle phase. In general, the absence of equinoctial asymmetry may be due to the fact that in equinox and for each solar cycle phase, the asymmetry is due to Russell-McPherron mechanism. The solstice anomaly or annual anomaly is always observed throughout solar cycle phase. The minimum value of ΔfoF2 is inferior than −60% seen during all solar cycle phase at 0700 LT. This annual asymmetry may be due to interplanetary corpuscular radiation.