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

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

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008angeo..26.1221j&link_type=abstract

Annales Geophysicae, Volume 26, Issue 5, 2008, pp.1221-1232

Physics

7

Scientific paper

Long-period oscillations in the period range 2-30 days, interpreted as planetary wave (PW) signatures, have been analysed using daily mesosphere/lower thermosphere wind measurements near 90 km over Collm (52° N, 15° E) in the time interval 1980-2005. 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-term trends are visible, which are positive in the zonal component, but negative in the meridional component. There is a tendency of the trend to be non-linear for waves with periods lower than 7 days, so that a climatic transition appears around 1990, with smaller changes before and after that time. A solar cycle effect on PW is weak, but there is a tendency for a positive correlation between solar flux and wave activity, if a time lag of PW activity with respect to the solar flux of about 2 years is taken into consideration.

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