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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 18, issue 12
Ann. Geophys., 18, 1651–1656, 2000
https://doi.org/10.1007/s00585-001-1651-8
© European Geosciences Union 2000
Ann. Geophys., 18, 1651–1656, 2000
https://doi.org/10.1007/s00585-001-1651-8
© European Geosciences Union 2000

  31 Dec 2000

31 Dec 2000

On the fast movements of the thermosphere: an interpretation

J. Lilensten1 and P. O. Amblard2 J. Lilensten and P. O. Amblard
  • 1Laboratoire de Planétologie de Grenoble; Observatoire des Sciences de l'Univers de Grenoble; Bâtiment D de Physique; BP 53; 38041 Grenoble cedex 9. France
  • 2LIG-INPG, BP 46, 38402 Saint Martin d'Hères cedex, France

Abstract. We examine the oscillations of the meridional neutral wind in the F region as seen by the EISCAT radar. We propose an interpretation in term of eddies (tourbillons) of typical size of a few tens to a few hundreds of kilometers. The observed rotation velocity is a few hundreds of meters per second. We suggest that the tourbillons are a common feature of thermospheric movements. We propose an optical experiment to check the validity of this assumption.

Key words: Atmospheric composition and structure (thermosphere · composition and chemistry) · Ionosphere (ionosphere · atmosphere interactions)

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