[6] The variations in the height of the F2-layer maximum are mainly determined by variations in the parameters of the neutral atmosphere and plasma vertical drift induced by the thermospheric wind. The effects of the meridional and zonal components of the wind differ considerably. We will try to estimate the contribution of each factor into the longitudinal and latitudinal variations in hmF2. We will solve the inverse problem. At the first stage we determine the variations in the velocity W of the plasma vertical drift from the known variations in hmF2. To do this we first calculate the longitudinal variations of the balance height hm0 related to variations in the composition and temperature of the thermosphere. At the second stage, using the calculated longitudinal variations in W we determine the components of the neutral wind.
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