Pre-noon high-latitude auroral arcs as a manifestation of the interchange instability
International audience 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 B y -dominated ( B y = + 8.8, B z = + 4.3) to strongly northward dominat...
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ftinsu:oai:HAL:hal-00317199v1 2023-11-12T04:15:06+01:00 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. Sodankylä Geophysical Observatory University of Oulu Department of Physical Sciences Oulu Polar Geophysical Institute of Russian Academy of Sciences (PGI) Russian Academy of Sciences Moscow (RAS) Department of Physics and Engineering Physics University of Saskatchewan Saskatoon (U of S) 2003 https://hal.science/hal-00317199 https://hal.science/hal-00317199/document https://hal.science/hal-00317199/file/angeo-21-2303-2003.pdf en eng HAL CCSD European Geosciences Union hal-00317199 https://hal.science/hal-00317199 https://hal.science/hal-00317199/document https://hal.science/hal-00317199/file/angeo-21-2303-2003.pdf info:eu-repo/semantics/OpenAccess ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00317199 Annales Geophysicae, 2003, 21 (12), pp.2303-2314 [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2003 ftinsu 2023-10-25T16:25:19Z International audience 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 B y -dominated ( B y = + 8.8, B z = + 4.3) to strongly northward dominated ( B y = + 2.7, B z = + 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. Article in Journal/Newspaper Barentsburg Svalbard Institut national des sciences de l'Univers: HAL-INSU Barentsburg ENVELOPE(14.212,14.212,78.064,78.064) Svalbard |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences 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 |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience 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 B y -dominated ( B y = + 8.8, B z = + 4.3) to strongly northward dominated ( B y = + 2.7, B z = + 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. |
author2 |
Sodankylä Geophysical Observatory University of Oulu Department of Physical Sciences Oulu Polar Geophysical Institute of Russian Academy of Sciences (PGI) Russian Academy of Sciences Moscow (RAS) Department of Physics and Engineering Physics University of Saskatchewan Saskatoon (U of S) |
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 |
HAL CCSD |
publishDate |
2003 |
url |
https://hal.science/hal-00317199 https://hal.science/hal-00317199/document https://hal.science/hal-00317199/file/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_source |
ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00317199 Annales Geophysicae, 2003, 21 (12), pp.2303-2314 |
op_relation |
hal-00317199 https://hal.science/hal-00317199 https://hal.science/hal-00317199/document https://hal.science/hal-00317199/file/angeo-21-2303-2003.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782332537798918144 |