Probing discrete auroral arcs by ionospheric tomography
Abstract. 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 ®eld-aligned enhancements in the spatial distribution of E- and F-layer electron density respectively seen in images reconstructed by ionospheric tomogr...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.371.8334 2023-05-15T18:29:48+02:00 Probing discrete auroral arcs by ionospheric tomography J. Moen S. T. Berry L. Kersley B. Lybekk The Pennsylvania State University CiteSeerX Archives 1998 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.371.8334 http://hal.archives-ouvertes.fr/docs/00/31/63/91/PDF/angeo-16-574-1998.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.371.8334 http://hal.archives-ouvertes.fr/docs/00/31/63/91/PDF/angeo-16-574-1998.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://hal.archives-ouvertes.fr/docs/00/31/63/91/PDF/angeo-16-574-1998.pdf text 1998 ftciteseerx 2016-01-08T01:20:45Z Abstract. 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 ®eld-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) á Magnetospheric physics (Auroral phenomena) á Radio science (Ionospheric physics) 1 Text Svalbard Unknown Svalbard |
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English |
description |
Abstract. 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 ®eld-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) á Magnetospheric physics (Auroral phenomena) á Radio science (Ionospheric physics) 1 |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
J. Moen S. T. Berry L. Kersley B. Lybekk |
spellingShingle |
J. Moen S. T. Berry L. Kersley B. Lybekk Probing discrete auroral arcs by ionospheric tomography |
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 |
publishDate |
1998 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.371.8334 http://hal.archives-ouvertes.fr/docs/00/31/63/91/PDF/angeo-16-574-1998.pdf |
geographic |
Svalbard |
geographic_facet |
Svalbard |
genre |
Svalbard |
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Svalbard |
op_source |
http://hal.archives-ouvertes.fr/docs/00/31/63/91/PDF/angeo-16-574-1998.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.371.8334 http://hal.archives-ouvertes.fr/docs/00/31/63/91/PDF/angeo-16-574-1998.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766213180575449088 |