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Titel Summer sudden Na number density enhancements measured with the ALOMAR Weber Na Lidar
VerfasserIn D. Heinrich, H. Nesse, U. Blum, P. Acott, B. Williams, U.-P. Hoppe
Medientyp Artikel
Sprache Englisch
ISSN 0992-7689
Digitales Dokument URL
Erschienen In: Annales Geophysicae ; 26, no. 5 ; Nr. 26, no. 5 (2008-05-28), S.1057-1069
Datensatznummer 250016080
Publikation (Nr.) Volltext-Dokument vorhandencopernicus.org/angeo-26-1057-2008.pdf
 
Zusammenfassung
We present summer Na-densities and atmospheric temperatures measured 80 to 110 km above the Arctic Lidar Observatory for Middle Atmosphere Research (ALOMAR). The Weber Na Lidar is part of ALOMAR, located at 69° N in Norway, 150 km north of the Arctic Circle. The sun does not set here during the summer months, and measurements require a narrowband Faraday Anomalous Dispersion Optical Filter (FADOF).

We discuss an observed sudden enhancement in the Na number density around 22:00 UT on 1 to 2 June 2006. We compare this observation with previous summer measurements and find a frequent appearance of Na number density enhancements near local midnight. We describe the time of appearance, the altitude distribution, the duration and the strength of these enhancements and compare them to winter observations. We investigate possible formation mechanisms and, as others before, we find a strong link between these Na number density enhancements and sporadic E layers.
 
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