Non-linear interaction of the quasi 2-day wave and long-term oscillations in the summer midlatitude mesopause region as seen from LF D1 wind measurements over Central Europe (Collm, 52oN, 15oE)

Details Non-linear interaction of the quasi 2-day wave and long-term oscillations in the summer midlatitude mesopause region as seen from LF D1 wind measurements over Central Europe (Collm, 52oN, 15oE) Non-linear interaction of the quasi 2-day wave and long-term oscillations in the summer midlatitude mesopause region as seen from LF D1 wind measurements over Central Europe (Collm, 52oN, 15oE)

Jan 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jastp..60.1175j&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 60, Issue 12, p. 1175-1175.

Physics

12

Scientific paper

From night-time mesopause region wind measurements over Central Europe, the day-to-day variability of the measured quasi 2-day wave is investigated with respect to its correlation with summer planetary wave events. A 14-year dataset of summer winds is used. The results indicate that the 2-day wave is modulated by planetary waves, especially by the 16-day wave. Secondary frequencies that are expected, if a non-linear interaction between the waves is assumed, are found from regression analysis. Additionally, these secondary oscillations are modulated by the duration of the quasi 2-day wave event itself. Tertiary frequencies that belong to this modulation are also found from periodogram analysis. The long-term dataset analysis shows that the non-linear interaction is a regular phenomenon that is frequently found in connection with planetary wave activity in the summer upper mesosphere and lower thermosphere.

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