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

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Résumé

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.

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