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The longitudinal structureof the day-to-day variations of semidiurnal tide amplitudes is analysed based oncoordinated mesosphere/lower thermosphere wind measurements at several stationsduring three winter campaigns. Possible excitation sources of these variationsare discussed. Special attention is given to a nonlinear interaction between thesemidiurnal tide and the day-to-day mean wind variations. Data processingincludes the S-transform analysis which takes into account transient behaviourof secondary waves. It is shown that strong tidal modulations appear during astratospheric warming and may be caused by aperiodic mean wind variations duringthis event.  <b>Key words. </b>Meteorology andatmospheric dynamics (middle atmosphere dynamics; waves and tides

On the longitudinal structure of the transient day-to-day variation of the semidiurnal tide in the mid-latitude lower thermosphere − I. Winter season