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...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
1996-11-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/14/1170/1996/angeo-14-1170-1996.pdf |
| _version_ | 1798044669276323840 |
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| 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 |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-04-11T23:07:58Z |
| format | Article |
| id | doaj.art-c8570a5d4ea1459a8359013c159e2a17 |
| institution | Directory Open Access Journal |
| issn | 0992-7689 1432-0576 |
| language | English |
| last_indexed | 2024-04-11T23:07:58Z |
| publishDate | 1996-11-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Annales Geophysicae |
| spelling | doaj.art-c8570a5d4ea1459a8359013c159e2a172022-12-22T03:57:57ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05761996-11-01141170117610.1007/s00585-996-1170-8Imaging and EISCAT radar measurements of an auroral prebreakup eventV. Safargaleev0T. Turunen1W. Lyatsky2J. Manninen3A. Kozlovsky4Polar Geophysical Institute, Fersman St. 14, 184200 Apatity, RussiaGeophysical Observatory, FIN-99600 Sodankyla, FinlandPolar Geophysical Institute, Fersman St. 14, 184200 Apatity, RussiaGeophysical Observatory, FIN-99600 Sodankyla, FinlandPolar Geophysical Institute, Fersman St. 14, 184200 Apatity, RussiaThe 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.https://www.ann-geophys.net/14/1170/1996/angeo-14-1170-1996.pdf |
| spellingShingle | V. Safargaleev T. Turunen W. Lyatsky J. Manninen A. Kozlovsky Imaging and EISCAT radar measurements of an auroral prebreakup event Annales Geophysicae |
| title | 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_short | Imaging and EISCAT radar measurements of an auroral prebreakup event |
| title_sort | imaging and eiscat radar measurements of an auroral prebreakup event |
| url | https://www.ann-geophys.net/14/1170/1996/angeo-14-1170-1996.pdf |
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