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Ann. Geophys., 21, 787-796, 2003
www.ann-geophys.net/21/787/2003/
© European Geosciences Union 2003
Periodicities in energy dissipation rates in the auroral mesosphere/lower thermosphere
C. M. Hall1, S. Nozawa2, C. E. Meek3, A. H. Manson3, and Y. Luo3
1University of Tromsø, Norway
2Nagoya University, Japan
3University of Saskatchewan, Canada
Abstract. It is possible for
medium-frequency (MF) radar systems to estimate kinetic energy dissipation
rates by measuring signal fading times. Here, we present approximately 5 years
of such results from Tromsø (69° N, 19° E) and in particular, investigate
the periodicities present at different altitudes in the regime 80 to 100 km. We
detect the known annual variation in the mesosphere and the semiannual
variation on the lower thermosphere. In addition, other features are observed
including terannual and ~ 27-day components in the lower thermosphere.
Key words. Meteorology and
atmospheric dynamics (climatology; middle atmosphere dynamics; turbulence)
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