Annales Geophysicae
Annales Geophysicae
ANGEO
Articles | Volume 21, issue 3
Articles | Volume 21, issue 3
https://doi.org/10.5194/angeo-21-787-2003
© Author(s) 2003. This work is distributed under
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/angeo-21-787-2003
© Author(s) 2003. This work is distributed under
the Creative Commons Attribution 3.0 License.
Articles | Volume 21, issue 3
31 Mar 2003
 | 31 Mar 2003

Periodicities in energy dissipation rates in the auroral mesosphere/lower thermosphere

C. M. Hall, S. Nozawa, C. E. Meek, A. H. Manson, and Y. Luo

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)

How to cite. Hall, C. M., Nozawa, S., Meek, C. E., Manson, A. H., and Luo, Y.: Periodicities in energy dissipation rates in the auroral mesosphere/lower thermosphere, Ann. Geophys., 21, 787–796, https://doi.org/10.5194/angeo-21-787-2003, 2003.