Fluctuations in tidal (24-, 12-h) characteristics and oscillations (8-h-5-d) in the mesosphere and lower thermosphere (70-110 km): Saskatoon (52°N, 107°W), 1979-1981

Details Fluctuations in tidal (24-, 12-h) characteristics and oscillations (8-h-5-d) in the mesosphere and lower thermosphere (70-110 km): Saskatoon (52°N, 107°W), 1979-1981 Fluctuations in tidal (24-, 12-h) characteristics and oscillations (8-h-5-d) in the mesosphere and lower thermosphere (70-110 km): Saskatoon (52°N, 107°W), 1979-1981

Dec 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982p%26ss...30.1283m&link_type=abstract

Planetary and Space Science, Volume 30, Issue 12, p. 1283-1294.

Physics

10

Scientific paper

An M.F. radar (2.2 MHz) operating at Saskatoon, Canada (52°N, 107°W) has been used to produce continuous wind data (~ 80-110km) from September 1978-April 1981. The 24-, 12-h tidal oscillations reveal regular summer-winter transitions; in particular the semi-diurnal tide demonstrates strikingly regular and rapid equinoctial changes over the three years. The vernal and autumnal equinox changes are clearly different in morphology. Shorter term tidal fluctuations (2d <~ τ <~ 10d) are compared with mean winds and gravity wave amplitudes, as well as with satellite-derived stratospheric temperatures.
Spectral analysis of monthly data sets for 1980, from ~ 90-105 km, reveal oscillations of the expected 8-, 12-, 24-h periods, but also of ~ 10-, ~16- and ~ 2-, 5/6d. A modulation of the ``2-d'' wave by the 12-h wave is suggested as a possible cause of these surprisingly regular oscillations.
Permanent address: Physical Research Laboratory, Nagrangpura, Ahmedabad-380 009 India.

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