Solar and seasonal dependence of ion frictional heating
Ion frictional heating constitutes one of the principal mechanisms whereby energy, originating in the solar wind, is deposited into the Earth's ionosphere and ultimately the neutral atmosphere. Common programme observations by the EISCAT UHF radar system, spanning the years 1984 to 1995, provid...
Published in: | Annales Geophysicae |
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European Geosciences Union (EGU), Copernicus Publications, Springer Verlag (Germany)
2012
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Online Access: | http://hdl.handle.net/2381/18376 http://www.ann-geophys.net/17/682/1999/angeo-17-682-1999.html https://doi.org/10.1007/s00585-999-0682-4 |
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ftleicester:oai:lra.le.ac.uk:2381/18376 2023-05-15T16:04:32+02:00 Solar and seasonal dependence of ion frictional heating Davies, J. A. Lester, Mark McCrea, I. W. 2012-10-24T09:05:25Z http://hdl.handle.net/2381/18376 http://www.ann-geophys.net/17/682/1999/angeo-17-682-1999.html https://doi.org/10.1007/s00585-999-0682-4 English eng European Geosciences Union (EGU), Copernicus Publications, Springer Verlag (Germany) ANNALES GEOPHYSICAE-ATMOSPHERES HYDROSPHERES AND SPACE SCIENCES, 1999, 17 (5), pp. 682-691 0992-7689 http://hdl.handle.net/2381/18376 http://www.ann-geophys.net/17/682/1999/angeo-17-682-1999.html doi:10.1007/s00585-999-0682-4 1432-0576 Archived with reference to SHERPA/RoMEO and publisher website. © European Geosciences Union 1999. Version of record: http://www.ann-geophys.net/17/682/1999/angeo-17-682-1999.html Web of Science http://webofknowledge.com Science & Technology Physical Sciences Astronomy & Astrophysics Geosciences Multidisciplinary Meteorology & Atmospheric Sciences Geology ionosphere (auroral ionosphere ionosphere-atmosphere interactions plasma temperature and density) HIGH-LATITUDE IONOSPHERE VELOCITY DISTRIBUTIONS F-REGION THERMOSPHERIC WINDS ELECTRIC-FIELDS EISCAT TEMPERATURE PLASMA MODEL Journal Article 2012 ftleicester https://doi.org/10.1007/s00585-999-0682-4 2019-03-22T20:16:40Z Ion frictional heating constitutes one of the principal mechanisms whereby energy, originating in the solar wind, is deposited into the Earth's ionosphere and ultimately the neutral atmosphere. Common programme observations by the EISCAT UHF radar system, spanning the years 1984 to 1995, provide the basis for a comprehensive statistical study of ion frictional heating, results of which are documented in this and a previous paper by the authors. In the present work, the authors demonstrate the solar and seasonal dependence of the universal time distribution of frictional heating, and explain these results with reference to corresponding dependences of the ion velocity. Although EISCAT observes a significant increase in the occurrence of enhanced ion velocities associated with increased solar activity, the latter characterised according to the prevailing 10.7 cm solar flux, this is not reflected to such an extent in the occurrence of frictional heating. It is suggested that this is a consequence of the decreased neutral atmosphere response times associated with active solar conditions, resulting from the higher ionospheric plasma densities present. Seasonal effects on the diurnal distribution of ion frictional heating are well explained by corresponding variations in ionospheric convection, the latter principally a result of geometrical factors. It is noted that, over the entire dataset, the variations in the unperturbed F-region ion temperature, required to implement the identification criterion for ion heating, are highly correlated with model values of thermospheric temperature. 42149 Article in Journal/Newspaper EISCAT University of Leicester: Leicester Research Archive (LRA) Annales Geophysicae 17 5 682 691 |
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 ionosphere (auroral ionosphere ionosphere-atmosphere interactions plasma temperature and density) HIGH-LATITUDE IONOSPHERE VELOCITY DISTRIBUTIONS F-REGION THERMOSPHERIC WINDS ELECTRIC-FIELDS EISCAT TEMPERATURE PLASMA MODEL |
spellingShingle |
Science & Technology Physical Sciences Astronomy & Astrophysics Geosciences Multidisciplinary Meteorology & Atmospheric Sciences Geology ionosphere (auroral ionosphere ionosphere-atmosphere interactions plasma temperature and density) HIGH-LATITUDE IONOSPHERE VELOCITY DISTRIBUTIONS F-REGION THERMOSPHERIC WINDS ELECTRIC-FIELDS EISCAT TEMPERATURE PLASMA MODEL Davies, J. A. Lester, Mark McCrea, I. W. Solar and seasonal dependence of ion frictional heating |
topic_facet |
Science & Technology Physical Sciences Astronomy & Astrophysics Geosciences Multidisciplinary Meteorology & Atmospheric Sciences Geology ionosphere (auroral ionosphere ionosphere-atmosphere interactions plasma temperature and density) HIGH-LATITUDE IONOSPHERE VELOCITY DISTRIBUTIONS F-REGION THERMOSPHERIC WINDS ELECTRIC-FIELDS EISCAT TEMPERATURE PLASMA MODEL |
description |
Ion frictional heating constitutes one of the principal mechanisms whereby energy, originating in the solar wind, is deposited into the Earth's ionosphere and ultimately the neutral atmosphere. Common programme observations by the EISCAT UHF radar system, spanning the years 1984 to 1995, provide the basis for a comprehensive statistical study of ion frictional heating, results of which are documented in this and a previous paper by the authors. In the present work, the authors demonstrate the solar and seasonal dependence of the universal time distribution of frictional heating, and explain these results with reference to corresponding dependences of the ion velocity. Although EISCAT observes a significant increase in the occurrence of enhanced ion velocities associated with increased solar activity, the latter characterised according to the prevailing 10.7 cm solar flux, this is not reflected to such an extent in the occurrence of frictional heating. It is suggested that this is a consequence of the decreased neutral atmosphere response times associated with active solar conditions, resulting from the higher ionospheric plasma densities present. Seasonal effects on the diurnal distribution of ion frictional heating are well explained by corresponding variations in ionospheric convection, the latter principally a result of geometrical factors. It is noted that, over the entire dataset, the variations in the unperturbed F-region ion temperature, required to implement the identification criterion for ion heating, are highly correlated with model values of thermospheric temperature. 42149 |
format |
Article in Journal/Newspaper |
author |
Davies, J. A. Lester, Mark McCrea, I. W. |
author_facet |
Davies, J. A. Lester, Mark McCrea, I. W. |
author_sort |
Davies, J. A. |
title |
Solar and seasonal dependence of ion frictional heating |
title_short |
Solar and seasonal dependence of ion frictional heating |
title_full |
Solar and seasonal dependence of ion frictional heating |
title_fullStr |
Solar and seasonal dependence of ion frictional heating |
title_full_unstemmed |
Solar and seasonal dependence of ion frictional heating |
title_sort |
solar and seasonal dependence of ion frictional heating |
publisher |
European Geosciences Union (EGU), Copernicus Publications, Springer Verlag (Germany) |
publishDate |
2012 |
url |
http://hdl.handle.net/2381/18376 http://www.ann-geophys.net/17/682/1999/angeo-17-682-1999.html https://doi.org/10.1007/s00585-999-0682-4 |
genre |
EISCAT |
genre_facet |
EISCAT |
op_source |
Web of Science http://webofknowledge.com |
op_relation |
ANNALES GEOPHYSICAE-ATMOSPHERES HYDROSPHERES AND SPACE SCIENCES, 1999, 17 (5), pp. 682-691 0992-7689 http://hdl.handle.net/2381/18376 http://www.ann-geophys.net/17/682/1999/angeo-17-682-1999.html doi:10.1007/s00585-999-0682-4 1432-0576 |
op_rights |
Archived with reference to SHERPA/RoMEO and publisher website. © European Geosciences Union 1999. Version of record: http://www.ann-geophys.net/17/682/1999/angeo-17-682-1999.html |
op_doi |
https://doi.org/10.1007/s00585-999-0682-4 |
container_title |
Annales Geophysicae |
container_volume |
17 |
container_issue |
5 |
container_start_page |
682 |
op_container_end_page |
691 |
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1766400109056098304 |