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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 29, issue 11
Ann. Geophys., 29, 1985–1996, 2011
https://doi.org/10.5194/angeo-29-1985-2011
© Author(s) 2011. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 29, 1985–1996, 2011
https://doi.org/10.5194/angeo-29-1985-2011
© Author(s) 2011. This work is distributed under
the Creative Commons Attribution 3.0 License.

Regular paper 04 Nov 2011

Regular paper | 04 Nov 2011

Winds and tides in the mid-latitude Southern Hemisphere upper mesosphere recorded with the Falkland Islands SuperDARN radar

R. E. Hibbins1,2, M. P. Freeman2, S. E. Milan3, and J. M. Ruohoniemi4 R. E. Hibbins et al.
  • 1Department of Physics, Norwegian University of Science and Technology (NTNU), Trondheim, Norway
  • 2British Antarctic Survey, Cambridge, UK
  • 3Department of Physics and Astronomy, University of Leicester, Leicester, UK
  • 4Virginia Tech, VA, USA

Abstract. Meteor wind data from the first year of operation of the Falkland Islands SuperDARN radar (52° S, 59° W) are used to characterize the atmospheric tides and background winds in the upper mesosphere above the South Atlantic. Strong (>40 m s−1) semidiurnal tides are observed in the winter time and large amplitude (>60 m s−1) bursts of quasi two-day wave activity are seen in January 2011. Data are in good agreement with those presented from the SAAMER meteor radar (54° S, 68° W). Comparison with SuperDARN meteor wind data from a geographically similar Northern Hemisphere site at Goose Bay (53° N 60° W) reveal clear interhemispheric differences especially in the semidiurnal and terdiurnal components of the tides. The winter time amplitudes of the tides are much stronger in the Southern Hemisphere than in the north. Background winds are observed to be significantly more polewards and westwards throughout the year than those predicted by the empirical horizontal wind model HWM07.

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