Pre-noon high-latitude auroral arcs as a manifestation of the interchange instability
On 7 December 2000, TV ASC camera in Barentsburg (Svalbard) observed pre-noon (at 09:00–10:00 MLT) rayed auroral arcs, which occurred at the pole-ward edge of the auroral oval after an IMF transition from By -dominated (By = + 8.8, Bz = + 4.3) to strongly northward dominated (By = + 2.7, Bz = + 8.6)...
Published in: | Annales Geophysicae |
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00035158 2023-05-15T15:39:16+02:00 Pre-noon high-latitude auroral arcs as a manifestation of the interchange instability Kozlovsky, A. E. Safargaleev, V. V. Jussila, J. R. T. Koustov, A. V. 2003-12 electronic https://doi.org/10.5194/angeo-21-2303-2003 https://noa.gwlb.de/receive/cop_mods_00035158 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00035112/angeo-21-2303-2003.pdf https://angeo.copernicus.org/articles/21/2303/2003/angeo-21-2303-2003.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-21-2303-2003 https://noa.gwlb.de/receive/cop_mods_00035158 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00035112/angeo-21-2303-2003.pdf https://angeo.copernicus.org/articles/21/2303/2003/angeo-21-2303-2003.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2003 ftnonlinearchiv https://doi.org/10.5194/angeo-21-2303-2003 2022-02-08T22:44:53Z On 7 December 2000, TV ASC camera in Barentsburg (Svalbard) observed pre-noon (at 09:00–10:00 MLT) rayed auroral arcs, which occurred at the pole-ward edge of the auroral oval after an IMF transition from By -dominated (By = + 8.8, Bz = + 4.3) to strongly northward dominated (By = + 2.7, Bz = + 8.6). The arcs appeared from the area of enhanced luminosity seen in the western (nightside) horizon, and developed to the east, progressing at a velocity of about 1.5 km/s. Simultaneously, the arcs were drifting poleward at a velocity of 300–500 m/s, whose value was equal to the F-region ionospheric plasma drift velocity observed by the Incoherent Scatter Radar (ESR). The arc appearance and motion corresponded well to the poleward expansion of the auroral oval following the IMF shift, which was observed by the UVI on board the Polar satellite. The observed auroras were associated with closed LLBL indicated by the particle precipitation data from DMSP satellites showing also several-keV electrons of PS origin. The observations allow us to suggest that the arcs arise due to the interchange instability that starts to develop at the boundary between the magnetospheric plasma and the magnetosheath flux tubes entering the closed magnetosphere due to the reconnection beyond the cusp after the IMF changes. The interchange instability can be suggested as a possible mechanism for the formation of the LLBL. Key words. Magnetospheric physics (auroral phenomena; magnetopause, cusp and boundary layers; magnetospheric configuration and dynamics) Article in Journal/Newspaper Barentsburg Svalbard Niedersächsisches Online-Archiv NOA Barentsburg ENVELOPE(14.212,14.212,78.064,78.064) Svalbard Annales Geophysicae 21 12 2303 2314 |
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Open Polar |
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Niedersächsisches Online-Archiv NOA |
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ftnonlinearchiv |
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English |
topic |
article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Kozlovsky, A. E. Safargaleev, V. V. Jussila, J. R. T. Koustov, A. V. Pre-noon high-latitude auroral arcs as a manifestation of the interchange instability |
topic_facet |
article Verlagsveröffentlichung |
description |
On 7 December 2000, TV ASC camera in Barentsburg (Svalbard) observed pre-noon (at 09:00–10:00 MLT) rayed auroral arcs, which occurred at the pole-ward edge of the auroral oval after an IMF transition from By -dominated (By = + 8.8, Bz = + 4.3) to strongly northward dominated (By = + 2.7, Bz = + 8.6). The arcs appeared from the area of enhanced luminosity seen in the western (nightside) horizon, and developed to the east, progressing at a velocity of about 1.5 km/s. Simultaneously, the arcs were drifting poleward at a velocity of 300–500 m/s, whose value was equal to the F-region ionospheric plasma drift velocity observed by the Incoherent Scatter Radar (ESR). The arc appearance and motion corresponded well to the poleward expansion of the auroral oval following the IMF shift, which was observed by the UVI on board the Polar satellite. The observed auroras were associated with closed LLBL indicated by the particle precipitation data from DMSP satellites showing also several-keV electrons of PS origin. The observations allow us to suggest that the arcs arise due to the interchange instability that starts to develop at the boundary between the magnetospheric plasma and the magnetosheath flux tubes entering the closed magnetosphere due to the reconnection beyond the cusp after the IMF changes. The interchange instability can be suggested as a possible mechanism for the formation of the LLBL. Key words. Magnetospheric physics (auroral phenomena; magnetopause, cusp and boundary layers; magnetospheric configuration and dynamics) |
format |
Article in Journal/Newspaper |
author |
Kozlovsky, A. E. Safargaleev, V. V. Jussila, J. R. T. Koustov, A. V. |
author_facet |
Kozlovsky, A. E. Safargaleev, V. V. Jussila, J. R. T. Koustov, A. V. |
author_sort |
Kozlovsky, A. E. |
title |
Pre-noon high-latitude auroral arcs as a manifestation of the interchange instability |
title_short |
Pre-noon high-latitude auroral arcs as a manifestation of the interchange instability |
title_full |
Pre-noon high-latitude auroral arcs as a manifestation of the interchange instability |
title_fullStr |
Pre-noon high-latitude auroral arcs as a manifestation of the interchange instability |
title_full_unstemmed |
Pre-noon high-latitude auroral arcs as a manifestation of the interchange instability |
title_sort |
pre-noon high-latitude auroral arcs as a manifestation of the interchange instability |
publisher |
Copernicus Publications |
publishDate |
2003 |
url |
https://doi.org/10.5194/angeo-21-2303-2003 https://noa.gwlb.de/receive/cop_mods_00035158 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00035112/angeo-21-2303-2003.pdf https://angeo.copernicus.org/articles/21/2303/2003/angeo-21-2303-2003.pdf |
long_lat |
ENVELOPE(14.212,14.212,78.064,78.064) |
geographic |
Barentsburg Svalbard |
geographic_facet |
Barentsburg Svalbard |
genre |
Barentsburg Svalbard |
genre_facet |
Barentsburg 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-21-2303-2003 https://noa.gwlb.de/receive/cop_mods_00035158 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00035112/angeo-21-2303-2003.pdf https://angeo.copernicus.org/articles/21/2303/2003/angeo-21-2303-2003.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/angeo-21-2303-2003 |
container_title |
Annales Geophysicae |
container_volume |
21 |
container_issue |
12 |
container_start_page |
2303 |
op_container_end_page |
2314 |
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1766370783336071168 |