Imaging and EISCAT radar measurements of an auroral prebreakup event
The results of coordinated EISCAT and TV-camera observations of a prebreakup event on 15 November 1993 have been considered. The variations of the luminosity of two parallel auroral arcs, plasma depletion on the poleward edge of one of these arcs as well as electron and ion temperatures in front of...
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Copernicus Publications
1996
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Online Access: | https://doi.org/10.1007/s00585-996-1170-8 https://doaj.org/article/c8570a5d4ea1459a8359013c159e2a17 |
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ftdoajarticles:oai:doaj.org/article:c8570a5d4ea1459a8359013c159e2a17 2023-05-15T16:04:25+02:00 Imaging and EISCAT radar measurements of an auroral prebreakup event V. Safargaleev T. Turunen W. Lyatsky J. Manninen A. Kozlovsky 1996-11-01T00:00:00Z https://doi.org/10.1007/s00585-996-1170-8 https://doaj.org/article/c8570a5d4ea1459a8359013c159e2a17 EN eng Copernicus Publications https://www.ann-geophys.net/14/1170/1996/angeo-14-1170-1996.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.1007/s00585-996-1170-8 0992-7689 1432-0576 https://doaj.org/article/c8570a5d4ea1459a8359013c159e2a17 Annales Geophysicae, Vol 14, Pp 1170-1176 (1996) Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 article 1996 ftdoajarticles https://doi.org/10.1007/s00585-996-1170-8 2022-12-30T20:47:09Z The results of coordinated EISCAT and TV-camera observations of a prebreakup event on 15 November 1993 have been considered. The variations of the luminosity of two parallel auroral arcs, plasma depletion on the poleward edge of one of these arcs as well as electron and ion temperatures in front of a westward travelling surge were studied. It was found that a short-lived brightening of a weak zenith arc before an auroral breakup was accompanied by fading of an equatorial arc and, vice versa. A plasma depletion in the E region was detected by the EISCAT radar on the poleward edge of the zenith arc just before the auroral breakup. The plasma depletion was associated with an enhancement of ion (at the altitudes of 150–200 km) and electron (in E region) temperatures. During its occurrence, the electric field in the E-region was extremely large (~150 mV/m). A significant increase in ion temperature was also observed 1 min before the arrival of a westward travelling surge (WTS) at the radar zenith. This was interpreted as the existence of an extended area of enhanced electric field ahead of the WTS. Article in Journal/Newspaper EISCAT Directory of Open Access Journals: DOAJ Articles Annales Geophysicae 14 11 1170 1176 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
spellingShingle |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 V. Safargaleev T. Turunen W. Lyatsky J. Manninen A. Kozlovsky Imaging and EISCAT radar measurements of an auroral prebreakup event |
topic_facet |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
description |
The results of coordinated EISCAT and TV-camera observations of a prebreakup event on 15 November 1993 have been considered. The variations of the luminosity of two parallel auroral arcs, plasma depletion on the poleward edge of one of these arcs as well as electron and ion temperatures in front of a westward travelling surge were studied. It was found that a short-lived brightening of a weak zenith arc before an auroral breakup was accompanied by fading of an equatorial arc and, vice versa. A plasma depletion in the E region was detected by the EISCAT radar on the poleward edge of the zenith arc just before the auroral breakup. The plasma depletion was associated with an enhancement of ion (at the altitudes of 150–200 km) and electron (in E region) temperatures. During its occurrence, the electric field in the E-region was extremely large (~150 mV/m). A significant increase in ion temperature was also observed 1 min before the arrival of a westward travelling surge (WTS) at the radar zenith. This was interpreted as the existence of an extended area of enhanced electric field ahead of the WTS. |
format |
Article in Journal/Newspaper |
author |
V. Safargaleev T. Turunen W. Lyatsky J. Manninen A. Kozlovsky |
author_facet |
V. Safargaleev T. Turunen W. Lyatsky J. Manninen A. Kozlovsky |
author_sort |
V. Safargaleev |
title |
Imaging and EISCAT radar measurements of an auroral prebreakup event |
title_short |
Imaging and EISCAT radar measurements of an auroral prebreakup event |
title_full |
Imaging and EISCAT radar measurements of an auroral prebreakup event |
title_fullStr |
Imaging and EISCAT radar measurements of an auroral prebreakup event |
title_full_unstemmed |
Imaging and EISCAT radar measurements of an auroral prebreakup event |
title_sort |
imaging and eiscat radar measurements of an auroral prebreakup event |
publisher |
Copernicus Publications |
publishDate |
1996 |
url |
https://doi.org/10.1007/s00585-996-1170-8 https://doaj.org/article/c8570a5d4ea1459a8359013c159e2a17 |
genre |
EISCAT |
genre_facet |
EISCAT |
op_source |
Annales Geophysicae, Vol 14, Pp 1170-1176 (1996) |
op_relation |
https://www.ann-geophys.net/14/1170/1996/angeo-14-1170-1996.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.1007/s00585-996-1170-8 0992-7689 1432-0576 https://doaj.org/article/c8570a5d4ea1459a8359013c159e2a17 |
op_doi |
https://doi.org/10.1007/s00585-996-1170-8 |
container_title |
Annales Geophysicae |
container_volume |
14 |
container_issue |
11 |
container_start_page |
1170 |
op_container_end_page |
1176 |
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1766400038515245056 |