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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 22, issue 6
Ann. Geophys., 22, 1875–1884, 2004
https://doi.org/10.5194/angeo-22-1875-2004
© Author(s) 2004. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 22, 1875–1884, 2004
https://doi.org/10.5194/angeo-22-1875-2004
© Author(s) 2004. This work is distributed under
the Creative Commons Attribution 3.0 License.

  14 Jun 2004

14 Jun 2004

A case study of gravity waves in noctilucent clouds

P. Dalin1, S. Kirkwood1, A. Moström1, K. Stebel1, P. Hoffmann2, and W. Singer2 P. Dalin et al.
  • 1Swedish Institute of Space Physics, Box 812, SE-981 28 Kiruna, Sweden
  • 2Leibniz Institute of Atmospheric Physics, Schloss-Straße 6, 18225 Kühlungsborn, Germany

Abstract. We present a case study of a noctilucent cloud (NLC) display appearing on 10-11 August 2000 over Northern Sweden. Clear wave structures were visible in the clouds and time-lapse photography was used to derive the parameters characterising the gravity waves which could account for the observed NLC modulation. Using two nearby atmospheric radars, the Esrange MST Radar data and Andoya MF radar, we have identified gravity waves propagating upward from the upper stratosphere to NLC altitudes. The wave parameters derived from the radar measurements support the suggestion that gravity waves are responsible for the observed complex wave dynamics in the NLC.

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