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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 21, issue 3
Ann. Geophys., 21, 787–796, 2003
https://doi.org/10.5194/angeo-21-787-2003
© Author(s) 2003. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 21, 787–796, 2003
https://doi.org/10.5194/angeo-21-787-2003
© Author(s) 2003. This work is distributed under
the Creative Commons Attribution 3.0 License.

  31 Mar 2003

31 Mar 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 C. M. Hall et al.
  • 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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