Probing discrete auroral arcs by ionospheric tomography
Optical observations of 557.7 nm and 630.0 nm emissions from discrete auroral arcs in the post-noon sector have been related to localised field-aligned enhancements in the spatial distribution of E- and F-layer electron density respectively seen in images reconstructed by ionospheric tomography. Res...
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ftdoajarticles:oai:doaj.org/article:956d40fe326d4ee6bf8eeb519b48eea1 2023-05-15T18:29:48+02:00 Probing discrete auroral arcs by ionospheric tomography J. Moen S. T. Berry L. Kersley B. Lybekk 1998-05-01T00:00:00Z https://doi.org/10.1007/s00585-998-0574-z https://doaj.org/article/956d40fe326d4ee6bf8eeb519b48eea1 EN eng Copernicus Publications https://www.ann-geophys.net/16/574/1998/angeo-16-574-1998.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.1007/s00585-998-0574-z 0992-7689 1432-0576 https://doaj.org/article/956d40fe326d4ee6bf8eeb519b48eea1 Annales Geophysicae, Vol 16, Pp 574-582 (1998) Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 article 1998 ftdoajarticles https://doi.org/10.1007/s00585-998-0574-z 2022-12-31T02:46:18Z Optical observations of 557.7 nm and 630.0 nm emissions from discrete auroral arcs in the post-noon sector have been related to localised field-aligned enhancements in the spatial distribution of E- and F-layer electron density respectively seen in images reconstructed by ionospheric tomography. Results from two case studies are presented in which meridian scanning photometer and all-sky camera observations on Svalbard have been compared to electron-density structures found by tomographic inversion of measurements made by reception of radio signals at a chain of four stations at high latitude. The F-layer features are long-lived and show exact correspondence to the red-line emissions. Transient arcs in green-line intensity result in E-region structures that are resolved in one case, but not in another where the dynamic auroral forms are separated by less than one degree of latitude. The signature of an inverted-V precipitation event is clearly evident in one example. Key words. Ionosphere (Auroral ionosphere) · Magnetospheric physics (Auroral phenomena) · Radio science (Ionospheric physics) Article in Journal/Newspaper Svalbard Directory of Open Access Journals: DOAJ Articles Svalbard Annales Geophysicae 16 5 574 582 |
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Open Polar |
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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. Moen S. T. Berry L. Kersley B. Lybekk Probing discrete auroral arcs by ionospheric tomography |
topic_facet |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
description |
Optical observations of 557.7 nm and 630.0 nm emissions from discrete auroral arcs in the post-noon sector have been related to localised field-aligned enhancements in the spatial distribution of E- and F-layer electron density respectively seen in images reconstructed by ionospheric tomography. Results from two case studies are presented in which meridian scanning photometer and all-sky camera observations on Svalbard have been compared to electron-density structures found by tomographic inversion of measurements made by reception of radio signals at a chain of four stations at high latitude. The F-layer features are long-lived and show exact correspondence to the red-line emissions. Transient arcs in green-line intensity result in E-region structures that are resolved in one case, but not in another where the dynamic auroral forms are separated by less than one degree of latitude. The signature of an inverted-V precipitation event is clearly evident in one example. Key words. Ionosphere (Auroral ionosphere) · Magnetospheric physics (Auroral phenomena) · Radio science (Ionospheric physics) |
format |
Article in Journal/Newspaper |
author |
J. Moen S. T. Berry L. Kersley B. Lybekk |
author_facet |
J. Moen S. T. Berry L. Kersley B. Lybekk |
author_sort |
J. Moen |
title |
Probing discrete auroral arcs by ionospheric tomography |
title_short |
Probing discrete auroral arcs by ionospheric tomography |
title_full |
Probing discrete auroral arcs by ionospheric tomography |
title_fullStr |
Probing discrete auroral arcs by ionospheric tomography |
title_full_unstemmed |
Probing discrete auroral arcs by ionospheric tomography |
title_sort |
probing discrete auroral arcs by ionospheric tomography |
publisher |
Copernicus Publications |
publishDate |
1998 |
url |
https://doi.org/10.1007/s00585-998-0574-z https://doaj.org/article/956d40fe326d4ee6bf8eeb519b48eea1 |
geographic |
Svalbard |
geographic_facet |
Svalbard |
genre |
Svalbard |
genre_facet |
Svalbard |
op_source |
Annales Geophysicae, Vol 16, Pp 574-582 (1998) |
op_relation |
https://www.ann-geophys.net/16/574/1998/angeo-16-574-1998.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.1007/s00585-998-0574-z 0992-7689 1432-0576 https://doaj.org/article/956d40fe326d4ee6bf8eeb519b48eea1 |
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https://doi.org/10.1007/s00585-998-0574-z |
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Annales Geophysicae |
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16 |
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574 |
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