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...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2008-05-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/26/1057/2008/angeo-26-1057-2008.pdf |
| _version_ | 1811316937429352448 |
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| author | D. Heinrich H. Nesse U. Blum U. Blum P. Acott B. Williams U.-P. Hoppe |
| author_facet | D. Heinrich H. Nesse U. Blum U. Blum P. Acott B. Williams U.-P. Hoppe |
| author_sort | D. Heinrich |
| collection | DOAJ |
| 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° 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. |
| first_indexed | 2024-04-13T11:57:59Z |
| format | Article |
| id | doaj.art-339ad4092f8c462f85af77f033b28c16 |
| institution | Directory Open Access Journal |
| issn | 0992-7689 1432-0576 |
| language | English |
| last_indexed | 2024-04-13T11:57:59Z |
| publishDate | 2008-05-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Annales Geophysicae |
| spelling | doaj.art-339ad4092f8c462f85af77f033b28c162022-12-22T02:47:52ZengCopernicus 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° 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 |
| 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 |
| title | 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_short | 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 |
| url | https://www.ann-geophys.net/26/1057/2008/angeo-26-1057-2008.pdf |
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