Evidence for solar-production as a source of polar-cap plasma
The focus of the study is a region of enhanced ionospheric densities observed by the EISCAT Svalbard radar in the polar F-region near local magnetic noon under conditions of IMF Bz<0. Multi-instrument observations, using optical, spacecraft and radar instrumentation, together with radio tomograph...
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00034966 2023-05-15T16:04:33+02:00 Evidence for solar-production as a source of polar-cap plasma Pryse, S. E. Sims, R. W. Moen, J. Kersley, L. Lorentzen, D. Denig, W. F. 2004-04 electronic https://doi.org/10.5194/angeo-22-1093-2004 https://noa.gwlb.de/receive/cop_mods_00034966 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00034920/angeo-22-1093-2004.pdf https://angeo.copernicus.org/articles/22/1093/2004/angeo-22-1093-2004.pdf eng eng Copernicus Publications Annales Geophysicae -- http://www.bibliothek.uni-regensburg.de/ezeit/?1458425 -- https://www.ann-geophys.net/ -- https://www.ann-geophys.net/volumes.html -- http://link.springer.com/journal/585 -- 1432-0576 https://doi.org/10.5194/angeo-22-1093-2004 https://noa.gwlb.de/receive/cop_mods_00034966 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00034920/angeo-22-1093-2004.pdf https://angeo.copernicus.org/articles/22/1093/2004/angeo-22-1093-2004.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2004 ftnonlinearchiv https://doi.org/10.5194/angeo-22-1093-2004 2022-02-08T22:44:59Z The focus of the study is a region of enhanced ionospheric densities observed by the EISCAT Svalbard radar in the polar F-region near local magnetic noon under conditions of IMF Bz<0. Multi-instrument observations, using optical, spacecraft and radar instrumentation, together with radio tomographic imaging, have been used to identify the source of the enhancement and establish the background ionospheric conditions. Soft-particle precipitation was ruled out as a candidate for the production. Tomographic observations identified a latitudinally restricted region of enhanced densities at sub-auroral latitudes, distinct from the normal mid-latitude ionosphere, which was likely to be the source. The evidence suggested that the increased sub-auroral densities were photoionisation produced at the equatorward edge of the afternoon high-latitude cell, where the plasma is exposed to sunlight for an extended period as it flows slowly sunward toward magnetic noon. It is proposed that this plasma, once in the noon sector, was drawn antisunward by the high-latitude convection toward polar latitudes where it was identified by the EISCAT Svalbard radar. The observations are discussed in terms of earlier modelling studies of polar patch densities. Key words. Ionosphere (polar ionosphere; plasma temerature; plasma convection) Article in Journal/Newspaper EISCAT Svalbard Niedersächsisches Online-Archiv NOA Svalbard Annales Geophysicae 22 4 1093 1102 |
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Open Polar |
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Niedersächsisches Online-Archiv NOA |
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ftnonlinearchiv |
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English |
topic |
article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Pryse, S. E. Sims, R. W. Moen, J. Kersley, L. Lorentzen, D. Denig, W. F. Evidence for solar-production as a source of polar-cap plasma |
topic_facet |
article Verlagsveröffentlichung |
description |
The focus of the study is a region of enhanced ionospheric densities observed by the EISCAT Svalbard radar in the polar F-region near local magnetic noon under conditions of IMF Bz<0. Multi-instrument observations, using optical, spacecraft and radar instrumentation, together with radio tomographic imaging, have been used to identify the source of the enhancement and establish the background ionospheric conditions. Soft-particle precipitation was ruled out as a candidate for the production. Tomographic observations identified a latitudinally restricted region of enhanced densities at sub-auroral latitudes, distinct from the normal mid-latitude ionosphere, which was likely to be the source. The evidence suggested that the increased sub-auroral densities were photoionisation produced at the equatorward edge of the afternoon high-latitude cell, where the plasma is exposed to sunlight for an extended period as it flows slowly sunward toward magnetic noon. It is proposed that this plasma, once in the noon sector, was drawn antisunward by the high-latitude convection toward polar latitudes where it was identified by the EISCAT Svalbard radar. The observations are discussed in terms of earlier modelling studies of polar patch densities. Key words. Ionosphere (polar ionosphere; plasma temerature; plasma convection) |
format |
Article in Journal/Newspaper |
author |
Pryse, S. E. Sims, R. W. Moen, J. Kersley, L. Lorentzen, D. Denig, W. F. |
author_facet |
Pryse, S. E. Sims, R. W. Moen, J. Kersley, L. Lorentzen, D. Denig, W. F. |
author_sort |
Pryse, S. E. |
title |
Evidence for solar-production as a source of polar-cap plasma |
title_short |
Evidence for solar-production as a source of polar-cap plasma |
title_full |
Evidence for solar-production as a source of polar-cap plasma |
title_fullStr |
Evidence for solar-production as a source of polar-cap plasma |
title_full_unstemmed |
Evidence for solar-production as a source of polar-cap plasma |
title_sort |
evidence for solar-production as a source of polar-cap plasma |
publisher |
Copernicus Publications |
publishDate |
2004 |
url |
https://doi.org/10.5194/angeo-22-1093-2004 https://noa.gwlb.de/receive/cop_mods_00034966 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00034920/angeo-22-1093-2004.pdf https://angeo.copernicus.org/articles/22/1093/2004/angeo-22-1093-2004.pdf |
geographic |
Svalbard |
geographic_facet |
Svalbard |
genre |
EISCAT Svalbard |
genre_facet |
EISCAT Svalbard |
op_relation |
Annales Geophysicae -- http://www.bibliothek.uni-regensburg.de/ezeit/?1458425 -- https://www.ann-geophys.net/ -- https://www.ann-geophys.net/volumes.html -- http://link.springer.com/journal/585 -- 1432-0576 https://doi.org/10.5194/angeo-22-1093-2004 https://noa.gwlb.de/receive/cop_mods_00034966 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00034920/angeo-22-1093-2004.pdf https://angeo.copernicus.org/articles/22/1093/2004/angeo-22-1093-2004.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/angeo-22-1093-2004 |
container_title |
Annales Geophysicae |
container_volume |
22 |
container_issue |
4 |
container_start_page |
1093 |
op_container_end_page |
1102 |
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1766400146837340160 |