Summer sudden Na number density enhancements measured with the ALOMAR Weber Na Lidar

Summer sudden Na number density enhancements measured with the ALOMAR Weber Na Lidar

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 duri...

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Main Authors: D. Heinrich, H. Nesse, U. Blum, P. Acott, B. Williams, U.-P. Hoppe
Format: Article
Language:English
Published: Copernicus Publications 2008-05-01
Series:Annales Geophysicae
Online Access:https://www.ann-geophys.net/26/1057/2008/angeo-26-1057-2008.pdf
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spelling doaj-339ad4092f8c462f85af77f033b28c162020-11-24T22:05:07ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05762008-05-01261057106910.5194/angeo-26-1057-2008Summer sudden Na number density enhancements measured with the ALOMAR Weber Na LidarD. Heinrich0H. Nesse1U. Blum2U. Blum3P. Acott4B. Williams5U.-P. Hoppe6Norwegian Defence Research Establishment (FFI), 2027 Kjeller, NorwayNorwegian Defence Research Establishment (FFI), 2027 Kjeller, NorwayNorwegian Defence Research Establishment (FFI), 2027 Kjeller, Norwaynow at: Fraunhofer-Institute for Technological Trend Analysis, Euskirchen, GermanyDepartment of Physics, Colorado State University, Fort Collins CO 80523-1875, USANorthWest Research Associates, Colorado Research Associates division, Boulder, CO 80301, USANorwegian Defence Research Establishment (FFI), 2027 Kjeller, NorwayWe 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&deg; 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). <br><br> 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.https://www.ann-geophys.net/26/1057/2008/angeo-26-1057-2008.pdf
collection DOAJ
language English
format Article
sources DOAJ
author D. Heinrich
H. Nesse
U. Blum
U. Blum
P. Acott
B. Williams
U.-P. Hoppe
spellingShingle D. Heinrich
H. Nesse
U. Blum
U. Blum
P. Acott
B. Williams
U.-P. Hoppe
Summer sudden Na number density enhancements measured with the ALOMAR Weber Na Lidar
Annales Geophysicae
author_facet D. Heinrich
H. Nesse
U. Blum
U. Blum
P. Acott
B. Williams
U.-P. Hoppe
author_sort D. Heinrich
title Summer sudden Na number density enhancements measured with the ALOMAR Weber Na Lidar
title_short Summer sudden Na number density enhancements measured with the ALOMAR Weber Na Lidar
title_full Summer sudden Na number density enhancements measured with the ALOMAR Weber Na Lidar
title_fullStr Summer sudden Na number density enhancements measured with the ALOMAR Weber Na Lidar
title_full_unstemmed Summer sudden Na number density enhancements measured with the ALOMAR Weber Na Lidar
title_sort summer sudden na number density enhancements measured with the alomar weber na lidar
publisher Copernicus Publications
series Annales Geophysicae
issn 0992-7689
1432-0576
publishDate 2008-05-01
description 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&deg; 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). <br><br> 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.
url https://www.ann-geophys.net/26/1057/2008/angeo-26-1057-2008.pdf
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