Medium-scale 4-D ionospheric tomography using a dense GPS network
The ionosphere above Scandinavia in December 2006 is successfully imaged by 4-dimensional tomography using the software package MIDAS from the University of Bath. The method concentrates on medium-scale structures: between 100 km and 2000 km in horizontal size. The input consists of TEC measurements...
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00023564 2023-05-15T16:04:29+02:00 Medium-scale 4-D ionospheric tomography using a dense GPS network van de Kamp, M. M. J. L. 2013-01 electronic https://doi.org/10.5194/angeo-31-75-2013 https://noa.gwlb.de/receive/cop_mods_00023564 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00023519/angeo-31-75-2013.pdf https://angeo.copernicus.org/articles/31/75/2013/angeo-31-75-2013.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-31-75-2013 https://noa.gwlb.de/receive/cop_mods_00023564 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00023519/angeo-31-75-2013.pdf https://angeo.copernicus.org/articles/31/75/2013/angeo-31-75-2013.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2013 ftnonlinearchiv https://doi.org/10.5194/angeo-31-75-2013 2022-02-08T22:50:36Z The ionosphere above Scandinavia in December 2006 is successfully imaged by 4-dimensional tomography using the software package MIDAS from the University of Bath. The method concentrates on medium-scale structures: between 100 km and 2000 km in horizontal size. The input consists of TEC measurements from the dense GPS network Geotrim in Finland. In order to ensure sufficient vertical resolution of the result, EISCAT incoherent scatter radar data from Tromsø are used as additional input to provide the vertical profile information. The TEC offset of the measurements is unknown, but the inversion procedure is able to determine this automatically. This auto-calibration is shown to work well. Comparisons with EISCAT radar results and with occultation results show that the inversion using EISCAT data for profile information is much better able to resolve vertical profiles of irregular structures than the inversion using built-in profiles. Still, with either method the intensities of irregular structures of sizes near the resolution (about 100 km horizontal size) can be underestimated. Also, the accuracy of the inversion worsens above areas where no receivers are available. The ionosphere over Scandinavia in December 2006 often showed a dense E-layer in early morning hours, which generally disappeared during midday when a dense F-layer was present. On 14 December, a strong coronal mass ejection occurred, and many intense irregularities appeared in the ionosphere, which extended to high altitudes. Article in Journal/Newspaper EISCAT Tromsø Niedersächsisches Online-Archiv NOA Tromsø Annales Geophysicae 31 1 75 89 |
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English |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung van de Kamp, M. M. J. L. Medium-scale 4-D ionospheric tomography using a dense GPS network |
topic_facet |
article Verlagsveröffentlichung |
description |
The ionosphere above Scandinavia in December 2006 is successfully imaged by 4-dimensional tomography using the software package MIDAS from the University of Bath. The method concentrates on medium-scale structures: between 100 km and 2000 km in horizontal size. The input consists of TEC measurements from the dense GPS network Geotrim in Finland. In order to ensure sufficient vertical resolution of the result, EISCAT incoherent scatter radar data from Tromsø are used as additional input to provide the vertical profile information. The TEC offset of the measurements is unknown, but the inversion procedure is able to determine this automatically. This auto-calibration is shown to work well. Comparisons with EISCAT radar results and with occultation results show that the inversion using EISCAT data for profile information is much better able to resolve vertical profiles of irregular structures than the inversion using built-in profiles. Still, with either method the intensities of irregular structures of sizes near the resolution (about 100 km horizontal size) can be underestimated. Also, the accuracy of the inversion worsens above areas where no receivers are available. The ionosphere over Scandinavia in December 2006 often showed a dense E-layer in early morning hours, which generally disappeared during midday when a dense F-layer was present. On 14 December, a strong coronal mass ejection occurred, and many intense irregularities appeared in the ionosphere, which extended to high altitudes. |
format |
Article in Journal/Newspaper |
author |
van de Kamp, M. M. J. L. |
author_facet |
van de Kamp, M. M. J. L. |
author_sort |
van de Kamp, M. M. J. L. |
title |
Medium-scale 4-D ionospheric tomography using a dense GPS network |
title_short |
Medium-scale 4-D ionospheric tomography using a dense GPS network |
title_full |
Medium-scale 4-D ionospheric tomography using a dense GPS network |
title_fullStr |
Medium-scale 4-D ionospheric tomography using a dense GPS network |
title_full_unstemmed |
Medium-scale 4-D ionospheric tomography using a dense GPS network |
title_sort |
medium-scale 4-d ionospheric tomography using a dense gps network |
publisher |
Copernicus Publications |
publishDate |
2013 |
url |
https://doi.org/10.5194/angeo-31-75-2013 https://noa.gwlb.de/receive/cop_mods_00023564 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00023519/angeo-31-75-2013.pdf https://angeo.copernicus.org/articles/31/75/2013/angeo-31-75-2013.pdf |
geographic |
Tromsø |
geographic_facet |
Tromsø |
genre |
EISCAT Tromsø |
genre_facet |
EISCAT Tromsø |
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-31-75-2013 https://noa.gwlb.de/receive/cop_mods_00023564 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00023519/angeo-31-75-2013.pdf https://angeo.copernicus.org/articles/31/75/2013/angeo-31-75-2013.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/angeo-31-75-2013 |
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Annales Geophysicae |
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31 |
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1 |
container_start_page |
75 |
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89 |
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