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A dynamical effect in the ionospheric f₁ layer

Authors:	C Taieb G Scialom G Kockarts

Institution:	CRPE, 38 rue du Général Leclerc, F-92131 Issy-les-Moulineaux, France;IAS, 3 avenue Circulaire, B-1180 Bruxelles, Belgium

Abstract:	Incoherent scatter observations of the ionospheric F₁ layer above Saint-Santin (44.6°N) are analyzed after correction of a systematic error at 165 and 180 km altitude. The daytime valley observed around 200 km during summer for low solar activity conditions is explained in terms of a downward ionization drift which reaches ?30 m s^?1 around 180 km. Experimental determinations of the ion drift confirm the theoretical characteristics required for the summer daytime valley as well as for the winter behaviour without a valley. The computations require an effective dissociative recombination rate of $2.3 × 10^{?7} (300/ T_{e})^{0.7} (cm^{3} s^{?1})$ and ionizing fluxes compatible with solar activity conditions at the time when the valley is observed.

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