Using spectral characteristics to interpret auroral imaging in the 731.9 nm O+ line
Simultaneous observations were made of dynamic aurora during substorm activity on 26 January 2006 with three high spatial and temporal resolution instruments: the ASK (Auroral Structure and Kinetics) instrument, SIF (Spectrographic Imaging Facility) and ESR (EISCAT Svalbard Radar), all located on Sv...
Published in: | Annales Geophysicae |
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00031289 2023-05-15T16:04:45+02:00 Using spectral characteristics to interpret auroral imaging in the 731.9 nm O+ line Dahlgren, H. Ivchenko, N. Lanchester, B. S. Sullivan, J. Whiter, D. Marklund, G. Strømme, A. 2008-07 electronic https://doi.org/10.5194/angeo-26-1905-2008 https://noa.gwlb.de/receive/cop_mods_00031289 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00031243/angeo-26-1905-2008.pdf https://angeo.copernicus.org/articles/26/1905/2008/angeo-26-1905-2008.pdf eng eng Copernicus Publications Annales Geophysicae -- http://www.bibliothek.uni-regensburg.de/ezeit/?1458425 -- https://www.ann-geophys.net/ -- https://www.ann-geophys.net/volumes.html -- http://link.springer.com/journal/585 -- 1432-0576 https://doi.org/10.5194/angeo-26-1905-2008 https://noa.gwlb.de/receive/cop_mods_00031289 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00031243/angeo-26-1905-2008.pdf https://angeo.copernicus.org/articles/26/1905/2008/angeo-26-1905-2008.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2008 ftnonlinearchiv https://doi.org/10.5194/angeo-26-1905-2008 2022-02-08T22:46:49Z Simultaneous observations were made of dynamic aurora during substorm activity on 26 January 2006 with three high spatial and temporal resolution instruments: the ASK (Auroral Structure and Kinetics) instrument, SIF (Spectrographic Imaging Facility) and ESR (EISCAT Svalbard Radar), all located on Svalbard (78° N, 16.2° E). One of the narrow field of view ASK cameras is designed to detect O+ ion emission at 731.9 nm. From the spectrographic data we have been able to determine the amount of contaminating N2 and OH emission detected in the same filter. This is of great importance to further studies using the ASK instrument, when the O+ ion emission will be used to detect flows and afterglows in active aurora. The ratio of O+ to N2 emission is dependent on the energy spectra of electron precipitation, and was found to be related to changes in the morphology of the small-scale aurora. The ESR measured height profiles of electron densities, which allowed estimates to be made of the energy spectrum of the precipitation during the events studied with optical data from ASK and SIF. It was found that the higher energy precipitation corresponded to discrete and dynamic features, including curls, and low energy precipitation corresponded to auroral signatures that were dominated by rays. The evolution of these changes on time scales of seconds is of importance to theories of auroral acceleration mechanisms. Article in Journal/Newspaper EISCAT Svalbard Niedersächsisches Online-Archiv NOA Svalbard Annales Geophysicae 26 7 1905 1917 |
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Niedersächsisches Online-Archiv NOA |
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ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Dahlgren, H. Ivchenko, N. Lanchester, B. S. Sullivan, J. Whiter, D. Marklund, G. Strømme, A. Using spectral characteristics to interpret auroral imaging in the 731.9 nm O+ line |
topic_facet |
article Verlagsveröffentlichung |
description |
Simultaneous observations were made of dynamic aurora during substorm activity on 26 January 2006 with three high spatial and temporal resolution instruments: the ASK (Auroral Structure and Kinetics) instrument, SIF (Spectrographic Imaging Facility) and ESR (EISCAT Svalbard Radar), all located on Svalbard (78° N, 16.2° E). One of the narrow field of view ASK cameras is designed to detect O+ ion emission at 731.9 nm. From the spectrographic data we have been able to determine the amount of contaminating N2 and OH emission detected in the same filter. This is of great importance to further studies using the ASK instrument, when the O+ ion emission will be used to detect flows and afterglows in active aurora. The ratio of O+ to N2 emission is dependent on the energy spectra of electron precipitation, and was found to be related to changes in the morphology of the small-scale aurora. The ESR measured height profiles of electron densities, which allowed estimates to be made of the energy spectrum of the precipitation during the events studied with optical data from ASK and SIF. It was found that the higher energy precipitation corresponded to discrete and dynamic features, including curls, and low energy precipitation corresponded to auroral signatures that were dominated by rays. The evolution of these changes on time scales of seconds is of importance to theories of auroral acceleration mechanisms. |
format |
Article in Journal/Newspaper |
author |
Dahlgren, H. Ivchenko, N. Lanchester, B. S. Sullivan, J. Whiter, D. Marklund, G. Strømme, A. |
author_facet |
Dahlgren, H. Ivchenko, N. Lanchester, B. S. Sullivan, J. Whiter, D. Marklund, G. Strømme, A. |
author_sort |
Dahlgren, H. |
title |
Using spectral characteristics to interpret auroral imaging in the 731.9 nm O+ line |
title_short |
Using spectral characteristics to interpret auroral imaging in the 731.9 nm O+ line |
title_full |
Using spectral characteristics to interpret auroral imaging in the 731.9 nm O+ line |
title_fullStr |
Using spectral characteristics to interpret auroral imaging in the 731.9 nm O+ line |
title_full_unstemmed |
Using spectral characteristics to interpret auroral imaging in the 731.9 nm O+ line |
title_sort |
using spectral characteristics to interpret auroral imaging in the 731.9 nm o+ line |
publisher |
Copernicus Publications |
publishDate |
2008 |
url |
https://doi.org/10.5194/angeo-26-1905-2008 https://noa.gwlb.de/receive/cop_mods_00031289 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00031243/angeo-26-1905-2008.pdf https://angeo.copernicus.org/articles/26/1905/2008/angeo-26-1905-2008.pdf |
geographic |
Svalbard |
geographic_facet |
Svalbard |
genre |
EISCAT Svalbard |
genre_facet |
EISCAT Svalbard |
op_relation |
Annales Geophysicae -- http://www.bibliothek.uni-regensburg.de/ezeit/?1458425 -- https://www.ann-geophys.net/ -- https://www.ann-geophys.net/volumes.html -- http://link.springer.com/journal/585 -- 1432-0576 https://doi.org/10.5194/angeo-26-1905-2008 https://noa.gwlb.de/receive/cop_mods_00031289 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00031243/angeo-26-1905-2008.pdf https://angeo.copernicus.org/articles/26/1905/2008/angeo-26-1905-2008.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/angeo-26-1905-2008 |
container_title |
Annales Geophysicae |
container_volume |
26 |
container_issue |
7 |
container_start_page |
1905 |
op_container_end_page |
1917 |
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1766400384725680128 |