Daytime valley in the F1-region observed by incoherent scatter
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Incoherent scatter data obtained at Saint-Santin have been analyzed between 1969 and 1972 in the height interval 120-200 km. The summer daytime electron density profiles show a maximum around 150 km followed by a minimum around 165 km, when the solar activity is low. The seasonal and solar cycle variations of this phenomena are discussed. When the day-time valley exists, the maximum density is ca. 20-30 per cent greater than the minimum value. The phenomenon cannot be fully explained on the basis of photochemical equilibrium. A wind-shear mechanism could play an important role.
CitationTaieb, C.; Scialom, G.; Kockarts, G. (1975). Daytime valley in the F1-region observed by incoherent scatter. , Planetary and Space Science, Vol. 23, Issue 3, 523-531, DOI: 10.1016/0032-0633(75)90122-1.