The quasi 2-day wave as seen from D1 LF wind measurements over Central Europe (52°N, 15°E) at Collm

Details The quasi 2-day wave as seen from D1 LF wind measurements over Central Europe (52°N, 15°E) at Collm The quasi 2-day wave as seen from D1 LF wind measurements over Central Europe (52°N, 15°E) at Collm

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997jastp..59.1277j&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, v. 59, p. 1277-1286.

Physics

10

Scientific paper

The quasi 2-day wave at mesopause heights over Central Europe is investigated through a long-term study of mesopause winds at 95 km altitude at Collm, Germany. The wave is found in every year with a maximum amplitude in the months July and August. The zonal and meridional components have nearly the same amplitude and the phase difference between the horizontal components varies roughly between phase and quadrature. The northward maximum of the wind is found to occur preferentially near noon, thus, the phase is possibly locked to the solar tides. The period of the wave is changing during the respective events, so that as the amplitude grows the period shortens and vice versa. A dependence of the amplitude of the quasi 2-day wave on the solar cycle is found in such a way that the amplitude is larger during solar maximum. This can be explained by a dependence of the wave propagation on the mean wind, which in the lower mesopause region is directed towards the west in summer and is stronger during solar maximum. The amplitude of the quasi 2-day wave is correlated with the prevailing wind, but this result is only at a low significance level.

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