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Long-period oscillations in the period range 2–30 days, interpreted asplanetary wave (PW) signatures, have been analysed using dailymesosphere/lower thermosphere wind measurements near 90 km over Collm (52° N,15° E) in the time interval 1980–2005. Interannual and interdecadalvariability of PW are found. Since the 1990s, a tendency for larger zonalamplitudes compared to meridional ones has been observed, i.e. somelong-term trends are visible, which are positive in the zonal component, butnegative in the meridional component. There is a tendency of the trend to benon-linear for waves with periods lower than 7 days, so that a climatictransition appears around 1990, with smaller changes before and after thattime. A solar cycle effect on PW is weak, but there is a tendency for apositive correlation between solar flux and wave activity, if a time lag ofPW activity with respect to the solar flux of about 2 years is taken intoconsideration

Trends in MLT region winds and planetary waves, Collm (52° N, 15° E)