Large-scale distributions of ionospheric horizontal and field-aligned currents inferred from EISCAT
Statistical models for large-scale convection and for ionospheric conductances were previously derived from observations of the incoherent-scatter radar EISCAT. We complete this large-scale description with statistical models of the horizontal and field-aligned currents achieved from the same data b...
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ftdoajarticles:oai:doaj.org/article:7686e56414e04192a828af658e961658 2023-05-15T16:04:15+02:00 Large-scale distributions of ionospheric horizontal and field-aligned currents inferred from EISCAT D. Fontaine C. Peymirat 1996-12-01T00:00:00Z https://doi.org/10.1007/s00585-996-1284-z https://doaj.org/article/7686e56414e04192a828af658e961658 EN eng Copernicus Publications https://www.ann-geophys.net/14/1284/1996/angeo-14-1284-1996.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.1007/s00585-996-1284-z 0992-7689 1432-0576 https://doaj.org/article/7686e56414e04192a828af658e961658 Annales Geophysicae, Vol 14, Pp 1284-1296 (1996) Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 article 1996 ftdoajarticles https://doi.org/10.1007/s00585-996-1284-z 2022-12-31T05:23:14Z Statistical models for large-scale convection and for ionospheric conductances were previously derived from observations of the incoherent-scatter radar EISCAT. We complete this large-scale description with statistical models of the horizontal and field-aligned currents achieved from the same data base and for the same ranges of the magnetic activity index Kp . Except for the high-latitude dayside currents generally located poleward of the radar field of view, a large part of the whole current system can be probed with EISCAT. Globally consistent with previously published models, our results also exhibit some differences, such as the asymmetry in the local-time extension of the current sheets, concentrated to a few hours around 18 MLT in the evening sector, while widely spread from premidnight to prenoon magnetic local times on the morningside. This statistical description of the current system above EISCAT allowed us to examine several aspects of the large-scale auroral electrodynamics, namely the relationships between convection, conductances, and currents, in particular in the vicinity of the Harang discontinuity, and the features of the global current circuit. Article in Journal/Newspaper EISCAT Directory of Open Access Journals: DOAJ Articles Annales Geophysicae 14 12 1284 1296 |
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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 D. Fontaine C. Peymirat Large-scale distributions of ionospheric horizontal and field-aligned currents inferred from EISCAT |
topic_facet |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
description |
Statistical models for large-scale convection and for ionospheric conductances were previously derived from observations of the incoherent-scatter radar EISCAT. We complete this large-scale description with statistical models of the horizontal and field-aligned currents achieved from the same data base and for the same ranges of the magnetic activity index Kp . Except for the high-latitude dayside currents generally located poleward of the radar field of view, a large part of the whole current system can be probed with EISCAT. Globally consistent with previously published models, our results also exhibit some differences, such as the asymmetry in the local-time extension of the current sheets, concentrated to a few hours around 18 MLT in the evening sector, while widely spread from premidnight to prenoon magnetic local times on the morningside. This statistical description of the current system above EISCAT allowed us to examine several aspects of the large-scale auroral electrodynamics, namely the relationships between convection, conductances, and currents, in particular in the vicinity of the Harang discontinuity, and the features of the global current circuit. |
format |
Article in Journal/Newspaper |
author |
D. Fontaine C. Peymirat |
author_facet |
D. Fontaine C. Peymirat |
author_sort |
D. Fontaine |
title |
Large-scale distributions of ionospheric horizontal and field-aligned currents inferred from EISCAT |
title_short |
Large-scale distributions of ionospheric horizontal and field-aligned currents inferred from EISCAT |
title_full |
Large-scale distributions of ionospheric horizontal and field-aligned currents inferred from EISCAT |
title_fullStr |
Large-scale distributions of ionospheric horizontal and field-aligned currents inferred from EISCAT |
title_full_unstemmed |
Large-scale distributions of ionospheric horizontal and field-aligned currents inferred from EISCAT |
title_sort |
large-scale distributions of ionospheric horizontal and field-aligned currents inferred from eiscat |
publisher |
Copernicus Publications |
publishDate |
1996 |
url |
https://doi.org/10.1007/s00585-996-1284-z https://doaj.org/article/7686e56414e04192a828af658e961658 |
genre |
EISCAT |
genre_facet |
EISCAT |
op_source |
Annales Geophysicae, Vol 14, Pp 1284-1296 (1996) |
op_relation |
https://www.ann-geophys.net/14/1284/1996/angeo-14-1284-1996.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.1007/s00585-996-1284-z 0992-7689 1432-0576 https://doaj.org/article/7686e56414e04192a828af658e961658 |
op_doi |
https://doi.org/10.1007/s00585-996-1284-z |
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Annales Geophysicae |
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14 |
container_issue |
12 |
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1284 |
op_container_end_page |
1296 |
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