Testing an inversion method for estimating electron energy fluxes from all-sky camera images
An inversion method for reconstructing the precipitating electron energy flux from a set of multi-wavelength digital all-sky camera (ASC) images has recently been developed by tomografia. Preliminary tests suggested that the inversion is able to reconstruct the position and energy characteristics of...
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Copernicus Publications
2004
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00034861 2023-05-15T16:04:50+02:00 Testing an inversion method for estimating electron energy fluxes from all-sky camera images Partamies, N. Janhunen, P. Kauristie, K. Mäkinen, S. Sergienko, T. 2004-06 electronic https://doi.org/10.5194/angeo-22-1961-2004 https://noa.gwlb.de/receive/cop_mods_00034861 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00034815/angeo-22-1961-2004.pdf https://angeo.copernicus.org/articles/22/1961/2004/angeo-22-1961-2004.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-22-1961-2004 https://noa.gwlb.de/receive/cop_mods_00034861 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00034815/angeo-22-1961-2004.pdf https://angeo.copernicus.org/articles/22/1961/2004/angeo-22-1961-2004.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2004 ftnonlinearchiv https://doi.org/10.5194/angeo-22-1961-2004 2022-02-08T22:45:02Z An inversion method for reconstructing the precipitating electron energy flux from a set of multi-wavelength digital all-sky camera (ASC) images has recently been developed by tomografia. Preliminary tests suggested that the inversion is able to reconstruct the position and energy characteristics of the aurora with reasonable accuracy. This study carries out a thorough testing of the method and a few improvements for its emission physics equations. We compared the precipitating electron energy fluxes as estimated by the inversion method to the energy flux data recorded by the Defense Meteorological Satellite Program (DMSP) satellites during four passes over auroral structures. When the aurorae appear very close to the local zenith, the fluxes inverted from the blue (427.8nm) filtered ASC images or blue and green line (557.7nm) images together give the best agreement with the measured flux values. The fluxes inverted from green line images alone are clearly larger than the measured ones. Closer to the horizon the quality of the inversion results from blue images deteriorate to the level of the ones from green images. In addition to the satellite data, the precipitating electron energy fluxes were estimated from the electron density measurements by the EISCAT Svalbard Radar (ESR). These energy flux values were compared to the ones of the inversion method applied to over 100 ASC images recorded at the nearby ASC station in Longyearbyen. The energy fluxes deduced from these two types of data are in general of the same order of magnitude. In 35% of all of the blue and green image inversions the relative errors were less than 50% and in 90% of the blue and green image inversions less than 100%. This kind of systematic testing of the inversion method is the first step toward using all-sky camera images in the way in which global UV images have recently been used to estimate the energy fluxes. The advantages of ASCs, compared to the space-born imagers, are their low cost, good spatial resolution and the possibility of continuous, long-term monitoring of the auroral oval from a fixed position. Article in Journal/Newspaper EISCAT Longyearbyen Svalbard Niedersächsisches Online-Archiv NOA Longyearbyen Svalbard Annales Geophysicae 22 6 1961 1971 |
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Niedersächsisches Online-Archiv NOA |
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ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung Partamies, N. Janhunen, P. Kauristie, K. Mäkinen, S. Sergienko, T. Testing an inversion method for estimating electron energy fluxes from all-sky camera images |
topic_facet |
article Verlagsveröffentlichung |
description |
An inversion method for reconstructing the precipitating electron energy flux from a set of multi-wavelength digital all-sky camera (ASC) images has recently been developed by tomografia. Preliminary tests suggested that the inversion is able to reconstruct the position and energy characteristics of the aurora with reasonable accuracy. This study carries out a thorough testing of the method and a few improvements for its emission physics equations. We compared the precipitating electron energy fluxes as estimated by the inversion method to the energy flux data recorded by the Defense Meteorological Satellite Program (DMSP) satellites during four passes over auroral structures. When the aurorae appear very close to the local zenith, the fluxes inverted from the blue (427.8nm) filtered ASC images or blue and green line (557.7nm) images together give the best agreement with the measured flux values. The fluxes inverted from green line images alone are clearly larger than the measured ones. Closer to the horizon the quality of the inversion results from blue images deteriorate to the level of the ones from green images. In addition to the satellite data, the precipitating electron energy fluxes were estimated from the electron density measurements by the EISCAT Svalbard Radar (ESR). These energy flux values were compared to the ones of the inversion method applied to over 100 ASC images recorded at the nearby ASC station in Longyearbyen. The energy fluxes deduced from these two types of data are in general of the same order of magnitude. In 35% of all of the blue and green image inversions the relative errors were less than 50% and in 90% of the blue and green image inversions less than 100%. This kind of systematic testing of the inversion method is the first step toward using all-sky camera images in the way in which global UV images have recently been used to estimate the energy fluxes. The advantages of ASCs, compared to the space-born imagers, are their low cost, good spatial resolution and the possibility of continuous, long-term monitoring of the auroral oval from a fixed position. |
format |
Article in Journal/Newspaper |
author |
Partamies, N. Janhunen, P. Kauristie, K. Mäkinen, S. Sergienko, T. |
author_facet |
Partamies, N. Janhunen, P. Kauristie, K. Mäkinen, S. Sergienko, T. |
author_sort |
Partamies, N. |
title |
Testing an inversion method for estimating electron energy fluxes from all-sky camera images |
title_short |
Testing an inversion method for estimating electron energy fluxes from all-sky camera images |
title_full |
Testing an inversion method for estimating electron energy fluxes from all-sky camera images |
title_fullStr |
Testing an inversion method for estimating electron energy fluxes from all-sky camera images |
title_full_unstemmed |
Testing an inversion method for estimating electron energy fluxes from all-sky camera images |
title_sort |
testing an inversion method for estimating electron energy fluxes from all-sky camera images |
publisher |
Copernicus Publications |
publishDate |
2004 |
url |
https://doi.org/10.5194/angeo-22-1961-2004 https://noa.gwlb.de/receive/cop_mods_00034861 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00034815/angeo-22-1961-2004.pdf https://angeo.copernicus.org/articles/22/1961/2004/angeo-22-1961-2004.pdf |
geographic |
Longyearbyen Svalbard |
geographic_facet |
Longyearbyen Svalbard |
genre |
EISCAT Longyearbyen Svalbard |
genre_facet |
EISCAT Longyearbyen Svalbard |
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-22-1961-2004 https://noa.gwlb.de/receive/cop_mods_00034861 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00034815/angeo-22-1961-2004.pdf https://angeo.copernicus.org/articles/22/1961/2004/angeo-22-1961-2004.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/angeo-22-1961-2004 |
container_title |
Annales Geophysicae |
container_volume |
22 |
container_issue |
6 |
container_start_page |
1961 |
op_container_end_page |
1971 |
_version_ |
1766400481856323584 |