The 8-hour tide in the Arctic mesosphere and lower thermosphere

Details The 8-hour tide in the Arctic mesosphere and lower thermosphere The 8-hour tide in the Arctic mesosphere and lower thermosphere

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jgra..107.1420y&link_type=abstract

Journal of Geophysical Research (Space Physics), Volume 107, Issue A12, pp. SIA 2-1, CiteID 1420, DOI 10.1029/2001JA005086

Physics

Space Physics

12

Meteorology And Atmospheric Dynamics: Mesospheric Dynamics, Meteorology And Atmospheric Dynamics: Waves And Tides

Scientific paper

An all-sky VHF meteor radar at Esrange (68°N, 21°E) near Kiruna in Northern Sweden has been used to investigate the 8-hour tide in the Arctic mesosphere and lower thermosphere. We present a climatology of the 8-hour tide over the period October 1999 to April 2001. The tide appears to be a persistent feature of the Arctic atmosphere, although a large day-to-day variability of the tidal amplitude is observed. At times the 8-hour tide reaches amplitudes over 30 m s-1. The amplitude of the tide increases with height across the observed height range of ~80-100 km. Monthly mean tidal amplitudes range from <2 m s-1 to values as large as 10 m s-1. A clear seasonal behavior is apparent with maximum amplitudes observed in the autumn. Vertical wavelengths are shortest in winter and spring (25-35 km) and longest in summer and autumn (50-90 km). At least on some occasions the vertical wave number relationships between the 8-, 12-, and 24-hour tides suggest that the 8-hour tide is being generated by nonlinear interaction between the 12- and 24-hour tides.

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