Application of generalized aurora computed tomography to the EISCAT_3D project
EISCAT_3D is a project to build a multi-site phased-array incoherent scatter radar system in northern Fenno-Scandinavia. We demonstrate via numerical simulation how useful monochromatic images taken by a multi-point imager network are for auroral research in the EISCAT_3D project. We apply the gener...
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ftcopernicus:oai:publications.copernicus.org:angeo115991 2024-09-15T18:35:54+00:00 Application of generalized aurora computed tomography to the EISCAT_3D project Tanaka, Yoshimasa Ogawa, Yasunobu Kadokura, Akira Aso, Takehiko Gustavsson, Björn Brändström, Urban Sergienko, Tima Ueno, Genta Saita, Satoko 2024-05-29 application/pdf https://doi.org/10.5194/angeo-42-179-2024 https://angeo.copernicus.org/articles/42/179/2024/ eng eng doi:10.5194/angeo-42-179-2024 https://angeo.copernicus.org/articles/42/179/2024/ eISSN: 1432-0576 Text 2024 ftcopernicus https://doi.org/10.5194/angeo-42-179-2024 2024-08-28T05:24:15Z EISCAT_3D is a project to build a multi-site phased-array incoherent scatter radar system in northern Fenno-Scandinavia. We demonstrate via numerical simulation how useful monochromatic images taken by a multi-point imager network are for auroral research in the EISCAT_3D project. We apply the generalized aurora computed tomography (G-ACT) method to modelled observational data from real instruments, such as the Auroral Large Imaging System (ALIS) and the EISCAT_3D radar. G-ACT is a method for reconstructing the three-dimensional (3D) distribution of auroral emissions and ionospheric electron density (corresponding to the horizontal two-dimensional (2D) distribution of energy spectra of precipitating electrons) from multi-instrument data. It is assumed that the EISCAT_3D radar scans an area of 0.8° in geographic latitude and 3° in longitude at an altitude of 130 km with 10 × 10 beams from the radar core site at Skibotn (69.35° N, 20.37° E). Two neighboring discrete arcs are assumed to appear in the observation region of the EISCAT_3D radar. The reconstruction results from G-ACT are compared with those from the normal ACT as well as the ionospheric electron density from the radar. It is found that G-ACT can interpolate the ionospheric electron density at a much higher spatial resolution than that observed by the EISCAT_3D radar. Furthermore, the multiple arcs reconstructed by G-ACT are more precise than those by ACT. In particular, underestimation of the ionospheric electron density and precipitating electrons' energy fluxes inside the arcs is significantly improved by G-ACT including the EISCAT_3D data. Even when the ACT reconstruction is difficult due to the unsuitable locations of the imager sites relative to the discrete arcs and/or a small number of available images, G-ACT allows us to obtain better reconstruction results. Text Skibotn Copernicus Publications: E-Journals Annales Geophysicae 42 1 179 190 |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
EISCAT_3D is a project to build a multi-site phased-array incoherent scatter radar system in northern Fenno-Scandinavia. We demonstrate via numerical simulation how useful monochromatic images taken by a multi-point imager network are for auroral research in the EISCAT_3D project. We apply the generalized aurora computed tomography (G-ACT) method to modelled observational data from real instruments, such as the Auroral Large Imaging System (ALIS) and the EISCAT_3D radar. G-ACT is a method for reconstructing the three-dimensional (3D) distribution of auroral emissions and ionospheric electron density (corresponding to the horizontal two-dimensional (2D) distribution of energy spectra of precipitating electrons) from multi-instrument data. It is assumed that the EISCAT_3D radar scans an area of 0.8° in geographic latitude and 3° in longitude at an altitude of 130 km with 10 × 10 beams from the radar core site at Skibotn (69.35° N, 20.37° E). Two neighboring discrete arcs are assumed to appear in the observation region of the EISCAT_3D radar. The reconstruction results from G-ACT are compared with those from the normal ACT as well as the ionospheric electron density from the radar. It is found that G-ACT can interpolate the ionospheric electron density at a much higher spatial resolution than that observed by the EISCAT_3D radar. Furthermore, the multiple arcs reconstructed by G-ACT are more precise than those by ACT. In particular, underestimation of the ionospheric electron density and precipitating electrons' energy fluxes inside the arcs is significantly improved by G-ACT including the EISCAT_3D data. Even when the ACT reconstruction is difficult due to the unsuitable locations of the imager sites relative to the discrete arcs and/or a small number of available images, G-ACT allows us to obtain better reconstruction results. |
format |
Text |
author |
Tanaka, Yoshimasa Ogawa, Yasunobu Kadokura, Akira Aso, Takehiko Gustavsson, Björn Brändström, Urban Sergienko, Tima Ueno, Genta Saita, Satoko |
spellingShingle |
Tanaka, Yoshimasa Ogawa, Yasunobu Kadokura, Akira Aso, Takehiko Gustavsson, Björn Brändström, Urban Sergienko, Tima Ueno, Genta Saita, Satoko Application of generalized aurora computed tomography to the EISCAT_3D project |
author_facet |
Tanaka, Yoshimasa Ogawa, Yasunobu Kadokura, Akira Aso, Takehiko Gustavsson, Björn Brändström, Urban Sergienko, Tima Ueno, Genta Saita, Satoko |
author_sort |
Tanaka, Yoshimasa |
title |
Application of generalized aurora computed tomography to the EISCAT_3D project |
title_short |
Application of generalized aurora computed tomography to the EISCAT_3D project |
title_full |
Application of generalized aurora computed tomography to the EISCAT_3D project |
title_fullStr |
Application of generalized aurora computed tomography to the EISCAT_3D project |
title_full_unstemmed |
Application of generalized aurora computed tomography to the EISCAT_3D project |
title_sort |
application of generalized aurora computed tomography to the eiscat_3d project |
publishDate |
2024 |
url |
https://doi.org/10.5194/angeo-42-179-2024 https://angeo.copernicus.org/articles/42/179/2024/ |
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Skibotn |
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Skibotn |
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eISSN: 1432-0576 |
op_relation |
doi:10.5194/angeo-42-179-2024 https://angeo.copernicus.org/articles/42/179/2024/ |
op_doi |
https://doi.org/10.5194/angeo-42-179-2024 |
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Annales Geophysicae |
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42 |
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1 |
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179 |
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190 |
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1810479114411311104 |