Physics – Space Physics
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jgra..107.1004m&link_type=abstract
Journal of Geophysical Research (Space Physics), Volume 107, Issue A1, pp. SIA 2-1, CiteID 1004, DOI 10.1029/2001JA900127
Physics
Space Physics
34
Meteorology And Atmospheric Dynamics: Mesospheric Dynamics, Meteorology And Atmospheric Dynamics: Waves And Tides
Scientific paper
A new meteor radar has been deployed at Esrange (68°N,21°E) near Kiruna in Sweden. The radar has been used to measure windsand tides in the Arctic mesosphere/lower thermosphere region over the intervalAugust 1999 to July 2000. Conspicuous features of the measured mean windsinclude a strong shear of up to 5 m s-1 km-1in the summer zonal flow, resulting in eastward flows of in excess of 30 ms-1 at the upper heights observed (97 km). An equatorwardmeridional flow is observed in summer and winter, which reaches maximum valuesof ~13 m s-1 in a summer jet. Poleward flow incomparison is weak and only occurs at the equinoxes. The monthly mean andseasonal mean behaviors of the amplitudes and phases of the 12- and 24-hourtides are examined and compared to the Global Scale Wave Model-98. The observationsare generally very close to the model predictions for the 24-hour tide andfor the 12-hour tide in winter. In other seasons, particularly summer, theobserved 12-hour tidal amplitudes are significantly larger than those predicted.In spring and summer the wavelength of the 12-hour tide is significantly largerthan that predicted.
Hagan Maura E.
Middleton Richard H.
Mitchell Nick J.
Pancheva Dora
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