Probing discrete auroral arcs by ionospheric tomography
International audience 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 iono...
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ftccsdartic:oai:HAL:hal-00316391v1 2023-11-12T04:27:04+01:00 Probing discrete auroral arcs by ionospheric tomography Moen, J. Berry, S. T. Kersley, L. Lybekk, B. The University Centre in Svalbard (UNIS) Department of Physics University of Wales Department of Physics Oslo Faculty of Mathematics and Natural Sciences Oslo University of Oslo (UiO)-University of Oslo (UiO) 1998 https://hal.science/hal-00316391 https://hal.science/hal-00316391/document https://hal.science/hal-00316391/file/angeo-16-574-1998.pdf en eng HAL CCSD European Geosciences Union hal-00316391 https://hal.science/hal-00316391 https://hal.science/hal-00316391/document https://hal.science/hal-00316391/file/angeo-16-574-1998.pdf info:eu-repo/semantics/OpenAccess ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00316391 Annales Geophysicae, 1998, 16 (5), pp.574-582 [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 1998 ftccsdartic 2023-10-21T23:08:33Z International audience 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. Article in Journal/Newspaper Svalbard Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Svalbard |
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Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Moen, J. Berry, S. T. Kersley, L. Lybekk, B. Probing discrete auroral arcs by ionospheric tomography |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience 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. |
author2 |
The University Centre in Svalbard (UNIS) Department of Physics University of Wales Department of Physics Oslo Faculty of Mathematics and Natural Sciences Oslo University of Oslo (UiO)-University of Oslo (UiO) |
format |
Article in Journal/Newspaper |
author |
Moen, J. Berry, S. T. Kersley, L. Lybekk, B. |
author_facet |
Moen, J. Berry, S. T. Kersley, L. Lybekk, B. |
author_sort |
Moen, J. |
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 |
HAL CCSD |
publishDate |
1998 |
url |
https://hal.science/hal-00316391 https://hal.science/hal-00316391/document https://hal.science/hal-00316391/file/angeo-16-574-1998.pdf |
geographic |
Svalbard |
geographic_facet |
Svalbard |
genre |
Svalbard |
genre_facet |
Svalbard |
op_source |
ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00316391 Annales Geophysicae, 1998, 16 (5), pp.574-582 |
op_relation |
hal-00316391 https://hal.science/hal-00316391 https://hal.science/hal-00316391/document https://hal.science/hal-00316391/file/angeo-16-574-1998.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782340806381666304 |