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...
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Copernicus Publications
1997
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ftdoajarticles:oai:doaj.org/article:19990b9fe6614d66a13d188adede9136 2023-05-15T16:04:23+02:00 A statistical study of ion frictional heating observed by EISCAT J. A. Davies M. Lester I. W. McCrea 1997-11-01T00:00:00Z https://doi.org/10.1007/s00585-997-1399-x https://doaj.org/article/19990b9fe6614d66a13d188adede9136 EN eng Copernicus Publications https://www.ann-geophys.net/15/1399/1997/angeo-15-1399-1997.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.1007/s00585-997-1399-x 0992-7689 1432-0576 https://doaj.org/article/19990b9fe6614d66a13d188adede9136 Annales Geophysicae, Vol 15, Pp 1399-1411 (1997) Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 article 1997 ftdoajarticles https://doi.org/10.1007/s00585-997-1399-x 2023-01-08T01:30:43Z 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. Article in Journal/Newspaper EISCAT Directory of Open Access Journals: DOAJ Articles The ''Y'' ENVELOPE(-112.453,-112.453,57.591,57.591) Annales Geophysicae 15 11 1399 1411 |
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 J. A. Davies M. Lester I. W. McCrea A statistical study of ion frictional heating observed by EISCAT |
topic_facet |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
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. |
format |
Article in Journal/Newspaper |
author |
J. A. Davies M. Lester I. W. McCrea |
author_facet |
J. A. Davies M. Lester I. W. McCrea |
author_sort |
J. A. Davies |
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 |
Copernicus Publications |
publishDate |
1997 |
url |
https://doi.org/10.1007/s00585-997-1399-x https://doaj.org/article/19990b9fe6614d66a13d188adede9136 |
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 |
Annales Geophysicae, Vol 15, Pp 1399-1411 (1997) |
op_relation |
https://www.ann-geophys.net/15/1399/1997/angeo-15-1399-1997.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.1007/s00585-997-1399-x 0992-7689 1432-0576 https://doaj.org/article/19990b9fe6614d66a13d188adede9136 |
op_doi |
https://doi.org/10.1007/s00585-997-1399-x |
container_title |
Annales Geophysicae |
container_volume |
15 |
container_issue |
11 |
container_start_page |
1399 |
op_container_end_page |
1411 |
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1766400016569597952 |