Abstract
Abstract Ionospheric drift measurements in the LF range, which refer to altitudes between 80 and 100 km, make it possible to permanently monitor the circulation in the upper mesosphere/lower thermosphere region (MLT-region). A long-term (1975–1996) study of the MLT region dynamical structure at stations, well-spaced along 52°N latitude circle has revealed the nonzonality in the MLT dynamical structure. This non-zonality in the nighttime prevailing wind, tidal variability and planetary wave activity is considered including results obtained during the MLTCS, DYANA and CRISTA/MAHRSI Campaigns. The longitudinal variations could be interpreted as sign of “coupling from below” and may be important when empirical and physical upper atmosphere models are being formed.
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