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  4. A case study of a sporadic sodium layer observed by the ALOMAR Weber Na LIDAR
 
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2008
Journal Article
Titel

A case study of a sporadic sodium layer observed by the ALOMAR Weber Na LIDAR

Abstract
Several possible mechanisms for the production of sporadic sodium layers have been discussed in the literature, but none of them seem to explain all the accumulated observations. The hypotheses range from direct meteoric input, to energetic electron bombardment on meteoric smoke particles, to ion neutralization, to temperature dependent chemistry. The varied instrumentation located on Andoya and near Tromso in Norway gives us an opportunity to test the different theories applied to high latitude sporadic sodium layers. We use the ALOMAR Weber sodium lidar to monitor the appearance and characteristics of a sporadic sodium layer that was observed on 5 November 2005. We also monitor the temperature to test the hypotheses regarding a temperature dependent mechanism. The EISCAT Tromso Dynasonde, the ALOMAR/UiO All-sky camera and the SKiYMET meteor radar on Andoya are used to test the suggested relationships of sporadic sodium layers and sporadic E-layers, electron precipitation, and meteor deposition during this event. We find that more than one candidate is eligible to explain our observation of the sporadic sodium layer.
Author(s)
Nesse, H.
Norwegian Defence Research Establishment, Kjeller, Norway
Heinrich, D.
Norwegian Defence Research Establishment, Kjeller, Norway
Williams, B.
NorthWest Research Associates/Colorado Research Associates Division, Boulder, USA
Hoppe, U.-P.
Norwegian Defence Research Establishment, Kjeller, Norway
Stadsnes, J.
University of Bergen, Department of Physics and Technology, Bergen, Norway
Rietveld, M.
EISCAT Scientific Association, Tromso, Norway
Singer, W.
Leibniz Institute for Atmospheric Physics, Kühlungsborn, Germany
Blum, U.
Fraunhofer-Institut für Naturwissenschaftlich-Technische Trendanalysen INT
Sandanger, M.I.
University of Bergen, Department of Physics and Technology, Bergen, Norway
Trondsen, E.
University of Oslo, Department of Physics, Oslo, Norway
Zeitschrift
Annales Geophysicae
Thumbnail Image
DOI
10.5194/angeo-26-1071-2008
Externer Link
Externer Link
Language
English
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Fraunhofer-Institut für Naturwissenschaftlich-Technische Trendanalysen INT
Tags
  • atmospheric compositi...

  • ion chemistry of the ...

  • thermosphere-composit...

  • ionosphere

  • ionosphere-atmosphere...

  • ionospheric irregular...

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