Application of stochastic inversion in auroral tomography
A software package originally developed for satellite radio tomography is briefly introduced and its use in two-dimensional auroral tomography is described. The method is based on stochastic inversion, i.e. finding the most probable values of the unknown volume emission rates once the optical measur...
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ftcopernicus:oai:publications.copernicus.org:angeo33975 2023-05-15T18:34:21+02:00 Application of stochastic inversion in auroral tomography Nygrén, T. Markkanen, M. Lehtinen, M. Kaila, K. 2018-09-27 application/pdf https://doi.org/10.1007/s00585-996-1124-1 https://angeo.copernicus.org/articles/14/1124/1996/ eng eng doi:10.1007/s00585-996-1124-1 https://angeo.copernicus.org/articles/14/1124/1996/ eISSN: 1432-0576 Text 2018 ftcopernicus https://doi.org/10.1007/s00585-996-1124-1 2020-07-20T16:28:10Z A software package originally developed for satellite radio tomography is briefly introduced and its use in two-dimensional auroral tomography is described. The method is based on stochastic inversion, i.e. finding the most probable values of the unknown volume emission rates once the optical measurements are made using either a scanning photometer or an auroral camera. A set of simulation results is shown for a different number and separations of optical instruments at ground level. It is observed that arcs with a thickness of a few kilometers and separated by a few tens of kilometers are easily reconstructed. The maximum values of the inversion results, however, are often weaker than in the model. The most obvious reason for this is the grid size, which cannot be much smaller than the arc thickness. The grid necessarily generates a spatial averaging effect broadening the arc cross-sections and reducing the peak values. Finally, results from TV-camera observations at Tromsø and Esrange are shown. Although these sites are separated by more than 200 km, arcs close to Tromsø have been successfully reconstructed. Text Tromsø Copernicus Publications: E-Journals Esrange ENVELOPE(21.117,21.117,67.883,67.883) Tromsø Annales Geophysicae 14 11 1124 1133 |
institution |
Open Polar |
collection |
Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
A software package originally developed for satellite radio tomography is briefly introduced and its use in two-dimensional auroral tomography is described. The method is based on stochastic inversion, i.e. finding the most probable values of the unknown volume emission rates once the optical measurements are made using either a scanning photometer or an auroral camera. A set of simulation results is shown for a different number and separations of optical instruments at ground level. It is observed that arcs with a thickness of a few kilometers and separated by a few tens of kilometers are easily reconstructed. The maximum values of the inversion results, however, are often weaker than in the model. The most obvious reason for this is the grid size, which cannot be much smaller than the arc thickness. The grid necessarily generates a spatial averaging effect broadening the arc cross-sections and reducing the peak values. Finally, results from TV-camera observations at Tromsø and Esrange are shown. Although these sites are separated by more than 200 km, arcs close to Tromsø have been successfully reconstructed. |
format |
Text |
author |
Nygrén, T. Markkanen, M. Lehtinen, M. Kaila, K. |
spellingShingle |
Nygrén, T. Markkanen, M. Lehtinen, M. Kaila, K. Application of stochastic inversion in auroral tomography |
author_facet |
Nygrén, T. Markkanen, M. Lehtinen, M. Kaila, K. |
author_sort |
Nygrén, T. |
title |
Application of stochastic inversion in auroral tomography |
title_short |
Application of stochastic inversion in auroral tomography |
title_full |
Application of stochastic inversion in auroral tomography |
title_fullStr |
Application of stochastic inversion in auroral tomography |
title_full_unstemmed |
Application of stochastic inversion in auroral tomography |
title_sort |
application of stochastic inversion in auroral tomography |
publishDate |
2018 |
url |
https://doi.org/10.1007/s00585-996-1124-1 https://angeo.copernicus.org/articles/14/1124/1996/ |
long_lat |
ENVELOPE(21.117,21.117,67.883,67.883) |
geographic |
Esrange Tromsø |
geographic_facet |
Esrange Tromsø |
genre |
Tromsø |
genre_facet |
Tromsø |
op_source |
eISSN: 1432-0576 |
op_relation |
doi:10.1007/s00585-996-1124-1 https://angeo.copernicus.org/articles/14/1124/1996/ |
op_doi |
https://doi.org/10.1007/s00585-996-1124-1 |
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Annales Geophysicae |
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11 |
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