A statistical study of ion frictional heating observed by EISCAT
Results of a statistical survey of F-region ion frictional heating are presented, a survey which is based on over 4000 h of common programme observations taken by the European incoherent scatter (EISCAT) UHF radar facility. The criterion adopted in this study for the identification of ion frictional...
Published in: | Annales Geophysicae |
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Format: | Article in Journal/Newspaper |
Language: | English |
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European Geosciences Union (EGU), Copernicus Publications, Springer Verlag (Germany)
2012
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Online Access: | http://hdl.handle.net/2381/19758 http://www.ann-geophys.net/15/1399/1997/angeo-15-1399-1997.html https://doi.org/10.1007/s005850050555 |
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ftleicester:oai:lra.le.ac.uk:2381/19758 2023-05-15T16:04:26+02:00 A statistical study of ion frictional heating observed by EISCAT Davies, J. A. Lester, M. McCrea, I. W. 2012-10-24T09:07:34Z http://hdl.handle.net/2381/19758 http://www.ann-geophys.net/15/1399/1997/angeo-15-1399-1997.html https://doi.org/10.1007/s005850050555 English eng European Geosciences Union (EGU), Copernicus Publications, Springer Verlag (Germany) ANNALES GEOPHYSICAE-ATMOSPHERES HYDROSPHERES AND SPACE SCIENCES, 1997, 15 (11), pp. 1399-1411 0992-7689 http://hdl.handle.net/2381/19758 http://www.ann-geophys.net/15/1399/1997/angeo-15-1399-1997.html doi:10.1007/s005850050555 1432-0576 Archived with reference to SHERPA/RoMEO and publisher website. © European Geosciences Union 1997. Version of record: http://www.ann-geophys.net/15/1399/1997/angeo-15-1399-1997.html Web of Science http://webofknowledge.com Science & Technology Physical Sciences Astronomy & Astrophysics Geosciences Multidisciplinary Meteorology & Atmospheric Sciences Geology INTERPLANETARY MAGNETIC-FIELD INCOHERENT-SCATTER OBSERVATIONS CONVECTION ELECTRIC-FIELDS HIGH-LATITUDE IONOSPHERE DEPENDENT PLASMA-FLOW AURORAL F-REGION VELOCITY DISTRIBUTIONS TEMPERATURE ANISOTROPY DAYSIDE MAGNETOSPHERE THERMOSPHERIC WINDS Journal Article 2012 ftleicester https://doi.org/10.1007/s005850050555 2019-03-22T20:17:01Z Results of a statistical survey of F-region ion frictional heating are presented, a survey which is based on over 4000 h of common programme observations taken by the European incoherent scatter (EISCAT) UHF radar facility. The criterion adopted in this study for the identification of ion frictional heating was that defined by McCrea et al., requiring an enhancement in the F-region field-parallel ion temperature exceeding 100 K over two consecutive integration periods, which was itself based on a selection criterion for frictional heating derived for the study of high-latitude F-region ion temperature observations from the Atmospheric Explorer-C satellite. In the present study, the diurnal distribution of ion frictional heating observed by EISCAT is established and, furthermore, its dependence on geomagnetic activity and the orientation of the interplanetary magnetic field (IMF) is investigated; results are interpreted with reference to corresponding distributions of enhanced ion velocity, again derived from the extended set of EISCAT UHF common programme observations. The radar, due to its location relative to the large-scale convection pattern, observes ion frictional heating principally during the night, although preferentially during the post-midnight hours where there is reduced coupling between the ion and neutral populations. There is an increased preponderance of frictional heating during intervals of high geomagnetic activity and for a southward z component of the IMF and, moreover, evidence of asymmetries introduced by the y component of the IMF. 45600 Article in Journal/Newspaper EISCAT University of Leicester: Leicester Research Archive (LRA) The ''Y'' ENVELOPE(-112.453,-112.453,57.591,57.591) Annales Geophysicae 15 11 1399 |
institution |
Open Polar |
collection |
University of Leicester: Leicester Research Archive (LRA) |
op_collection_id |
ftleicester |
language |
English |
topic |
Science & Technology Physical Sciences Astronomy & Astrophysics Geosciences Multidisciplinary Meteorology & Atmospheric Sciences Geology INTERPLANETARY MAGNETIC-FIELD INCOHERENT-SCATTER OBSERVATIONS CONVECTION ELECTRIC-FIELDS HIGH-LATITUDE IONOSPHERE DEPENDENT PLASMA-FLOW AURORAL F-REGION VELOCITY DISTRIBUTIONS TEMPERATURE ANISOTROPY DAYSIDE MAGNETOSPHERE THERMOSPHERIC WINDS |
spellingShingle |
Science & Technology Physical Sciences Astronomy & Astrophysics Geosciences Multidisciplinary Meteorology & Atmospheric Sciences Geology INTERPLANETARY MAGNETIC-FIELD INCOHERENT-SCATTER OBSERVATIONS CONVECTION ELECTRIC-FIELDS HIGH-LATITUDE IONOSPHERE DEPENDENT PLASMA-FLOW AURORAL F-REGION VELOCITY DISTRIBUTIONS TEMPERATURE ANISOTROPY DAYSIDE MAGNETOSPHERE THERMOSPHERIC WINDS Davies, J. A. Lester, M. McCrea, I. W. A statistical study of ion frictional heating observed by EISCAT |
topic_facet |
Science & Technology Physical Sciences Astronomy & Astrophysics Geosciences Multidisciplinary Meteorology & Atmospheric Sciences Geology INTERPLANETARY MAGNETIC-FIELD INCOHERENT-SCATTER OBSERVATIONS CONVECTION ELECTRIC-FIELDS HIGH-LATITUDE IONOSPHERE DEPENDENT PLASMA-FLOW AURORAL F-REGION VELOCITY DISTRIBUTIONS TEMPERATURE ANISOTROPY DAYSIDE MAGNETOSPHERE THERMOSPHERIC WINDS |
description |
Results of a statistical survey of F-region ion frictional heating are presented, a survey which is based on over 4000 h of common programme observations taken by the European incoherent scatter (EISCAT) UHF radar facility. The criterion adopted in this study for the identification of ion frictional heating was that defined by McCrea et al., requiring an enhancement in the F-region field-parallel ion temperature exceeding 100 K over two consecutive integration periods, which was itself based on a selection criterion for frictional heating derived for the study of high-latitude F-region ion temperature observations from the Atmospheric Explorer-C satellite. In the present study, the diurnal distribution of ion frictional heating observed by EISCAT is established and, furthermore, its dependence on geomagnetic activity and the orientation of the interplanetary magnetic field (IMF) is investigated; results are interpreted with reference to corresponding distributions of enhanced ion velocity, again derived from the extended set of EISCAT UHF common programme observations. The radar, due to its location relative to the large-scale convection pattern, observes ion frictional heating principally during the night, although preferentially during the post-midnight hours where there is reduced coupling between the ion and neutral populations. There is an increased preponderance of frictional heating during intervals of high geomagnetic activity and for a southward z component of the IMF and, moreover, evidence of asymmetries introduced by the y component of the IMF. 45600 |
format |
Article in Journal/Newspaper |
author |
Davies, J. A. Lester, M. McCrea, I. W. |
author_facet |
Davies, J. A. Lester, M. McCrea, I. W. |
author_sort |
Davies, J. A. |
title |
A statistical study of ion frictional heating observed by EISCAT |
title_short |
A statistical study of ion frictional heating observed by EISCAT |
title_full |
A statistical study of ion frictional heating observed by EISCAT |
title_fullStr |
A statistical study of ion frictional heating observed by EISCAT |
title_full_unstemmed |
A statistical study of ion frictional heating observed by EISCAT |
title_sort |
statistical study of ion frictional heating observed by eiscat |
publisher |
European Geosciences Union (EGU), Copernicus Publications, Springer Verlag (Germany) |
publishDate |
2012 |
url |
http://hdl.handle.net/2381/19758 http://www.ann-geophys.net/15/1399/1997/angeo-15-1399-1997.html https://doi.org/10.1007/s005850050555 |
long_lat |
ENVELOPE(-112.453,-112.453,57.591,57.591) |
geographic |
The ''Y'' |
geographic_facet |
The ''Y'' |
genre |
EISCAT |
genre_facet |
EISCAT |
op_source |
Web of Science http://webofknowledge.com |
op_relation |
ANNALES GEOPHYSICAE-ATMOSPHERES HYDROSPHERES AND SPACE SCIENCES, 1997, 15 (11), pp. 1399-1411 0992-7689 http://hdl.handle.net/2381/19758 http://www.ann-geophys.net/15/1399/1997/angeo-15-1399-1997.html doi:10.1007/s005850050555 1432-0576 |
op_rights |
Archived with reference to SHERPA/RoMEO and publisher website. © European Geosciences Union 1997. Version of record: http://www.ann-geophys.net/15/1399/1997/angeo-15-1399-1997.html |
op_doi |
https://doi.org/10.1007/s005850050555 |
container_title |
Annales Geophysicae |
container_volume |
15 |
container_issue |
11 |
container_start_page |
1399 |
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1766400042681237504 |