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Trends in MLT region winds and planetary waves, Collm (52° N, 15° E)
<p><strong>Abstract.</strong> Long-period oscillations in the period range 2&ndash;30 days, interpreted as planetary wave (PW) signatures, have been analysed using daily mesosphere/lower thermosphere wind measurements near 90 km over Collm (52&deg; N, 15&deg; E) in the time interval 1980&ndash;2005. Interannual and interdecadal variability of PW are found. Since the 1990s, a tendency for larger zonal amplitudes compared to meridional ones has been observed, i.e. some long-termdoi:10.5194/angeo-26-1221-2008 fatcat:ujg35ia5a5gpbhjk7s7skxfjxq