Azimuthal expansion of high-latitude auroral arcs
International audience We used the TV auroral observations in Barentsburg (78.05° N 14.12° E) in Spitsbergen archipelago, together with the data of the CUTLASS HF radars and the POLAR satellite images to study azimuthal (in the east-west direction) expansion of the high-latitude auroral arcs. It is...
Main Authors: | , , , |
---|---|
Other Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2003
|
Subjects: | |
Online Access: | https://hal.science/hal-00317143 https://hal.science/hal-00317143/document https://hal.science/hal-00317143/file/angeo-21-1793-2003.pdf |
id |
ftccsdartic:oai:HAL:hal-00317143v1 |
---|---|
record_format |
openpolar |
spelling |
ftccsdartic:oai:HAL:hal-00317143v1 2023-11-12T04:15:06+01:00 Azimuthal expansion of high-latitude auroral arcs Safargaleev, V. V. Kozlovsky, A. E. Osipenko, S. V. Tagirov, V. R. Polar Geophysical Institute of Russian Academy of Sciences (PGI) Russian Academy of Sciences Moscow (RAS) Sodankylä Geophysical Observatory University of Oulu Department of Physical Sciences Oulu 2003 https://hal.science/hal-00317143 https://hal.science/hal-00317143/document https://hal.science/hal-00317143/file/angeo-21-1793-2003.pdf en eng HAL CCSD European Geosciences Union hal-00317143 https://hal.science/hal-00317143 https://hal.science/hal-00317143/document https://hal.science/hal-00317143/file/angeo-21-1793-2003.pdf info:eu-repo/semantics/OpenAccess ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00317143 Annales Geophysicae, 2003, 21 (8), pp.1793-1805 [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 ftccsdartic 2023-10-21T23:07:42Z International audience We used the TV auroral observations in Barentsburg (78.05° N 14.12° E) in Spitsbergen archipelago, together with the data of the CUTLASS HF radars and the POLAR satellite images to study azimuthal (in the east-west direction) expansion of the high-latitude auroral arcs. It is shown that the east or west edge of the arc moved in the same direction as the convection flow, westward in the pre-midnight sector and eastward in the post-midnight sector. The velocity of arc expansion was of the order of 2.5 km/s, which is 2?3 times larger than the convection velocity measured in the arc vicinity and 2?3 times smaller than the velocity of the bright patches propagating along the arc. The arc expanded from the active auroras seen from the POLAR satellite around midnight as a region of enhanced luminosity, which might be the auroral bulge or WTS. The pole- or equatorward drift of the arcs occurred at the velocity of the order of 100 m/s that was close to the convection velocity in the same direction. These experimental results can be well explained in terms of the interchange (or flute) instability. Article in Journal/Newspaper Barentsburg Spitsbergen Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Barentsburg ENVELOPE(14.212,14.212,78.064,78.064) |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
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 Safargaleev, V. V. Kozlovsky, A. E. Osipenko, S. V. Tagirov, V. R. Azimuthal expansion of high-latitude auroral arcs |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience We used the TV auroral observations in Barentsburg (78.05° N 14.12° E) in Spitsbergen archipelago, together with the data of the CUTLASS HF radars and the POLAR satellite images to study azimuthal (in the east-west direction) expansion of the high-latitude auroral arcs. It is shown that the east or west edge of the arc moved in the same direction as the convection flow, westward in the pre-midnight sector and eastward in the post-midnight sector. The velocity of arc expansion was of the order of 2.5 km/s, which is 2?3 times larger than the convection velocity measured in the arc vicinity and 2?3 times smaller than the velocity of the bright patches propagating along the arc. The arc expanded from the active auroras seen from the POLAR satellite around midnight as a region of enhanced luminosity, which might be the auroral bulge or WTS. The pole- or equatorward drift of the arcs occurred at the velocity of the order of 100 m/s that was close to the convection velocity in the same direction. These experimental results can be well explained in terms of the interchange (or flute) instability. |
author2 |
Polar Geophysical Institute of Russian Academy of Sciences (PGI) Russian Academy of Sciences Moscow (RAS) Sodankylä Geophysical Observatory University of Oulu Department of Physical Sciences Oulu |
format |
Article in Journal/Newspaper |
author |
Safargaleev, V. V. Kozlovsky, A. E. Osipenko, S. V. Tagirov, V. R. |
author_facet |
Safargaleev, V. V. Kozlovsky, A. E. Osipenko, S. V. Tagirov, V. R. |
author_sort |
Safargaleev, V. V. |
title |
Azimuthal expansion of high-latitude auroral arcs |
title_short |
Azimuthal expansion of high-latitude auroral arcs |
title_full |
Azimuthal expansion of high-latitude auroral arcs |
title_fullStr |
Azimuthal expansion of high-latitude auroral arcs |
title_full_unstemmed |
Azimuthal expansion of high-latitude auroral arcs |
title_sort |
azimuthal expansion of high-latitude auroral arcs |
publisher |
HAL CCSD |
publishDate |
2003 |
url |
https://hal.science/hal-00317143 https://hal.science/hal-00317143/document https://hal.science/hal-00317143/file/angeo-21-1793-2003.pdf |
long_lat |
ENVELOPE(14.212,14.212,78.064,78.064) |
geographic |
Barentsburg |
geographic_facet |
Barentsburg |
genre |
Barentsburg Spitsbergen |
genre_facet |
Barentsburg Spitsbergen |
op_source |
ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00317143 Annales Geophysicae, 2003, 21 (8), pp.1793-1805 |
op_relation |
hal-00317143 https://hal.science/hal-00317143 https://hal.science/hal-00317143/document https://hal.science/hal-00317143/file/angeo-21-1793-2003.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782332536521752576 |