Testing an inversion method for estimating electron energy fluxes from all-sky camera images

International audience 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 en...

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Main Authors: Partamies, N., Janhunen, P., Kauristie, K., Mäkinen, S., Sergienko, T.
Other Authors: Finnish Meteorological Institute (FMI), Department of Physics, Okayama University, Swedish Institute of Space Physics Kiruna (IRF)
Format: Article in Journal/Newspaper
Language:English
Published: HAL CCSD 2004
Subjects:
Online Access:https://hal.science/hal-00317398
https://hal.science/hal-00317398/document
https://hal.science/hal-00317398/file/angeo-22-1961-2004.pdf
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spelling ftinsu:oai:HAL:hal-00317398v1 2023-11-12T04:16:38+01:00 Testing an inversion method for estimating electron energy fluxes from all-sky camera images Partamies, N. Janhunen, P. Kauristie, K. Mäkinen, S. Sergienko, T. Finnish Meteorological Institute (FMI) Department of Physics Okayama University Swedish Institute of Space Physics Kiruna (IRF) 2004-06-14 https://hal.science/hal-00317398 https://hal.science/hal-00317398/document https://hal.science/hal-00317398/file/angeo-22-1961-2004.pdf en eng HAL CCSD European Geosciences Union hal-00317398 https://hal.science/hal-00317398 https://hal.science/hal-00317398/document https://hal.science/hal-00317398/file/angeo-22-1961-2004.pdf info:eu-repo/semantics/OpenAccess ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00317398 Annales Geophysicae, 2004, 22 (6), pp.1961-1971 [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2004 ftinsu 2023-10-25T16:25:17Z International audience 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 ... Article in Journal/Newspaper EISCAT Longyearbyen Svalbard Institut national des sciences de l'Univers: HAL-INSU Longyearbyen Svalbard
institution Open Polar
collection Institut national des sciences de l'Univers: HAL-INSU
op_collection_id ftinsu
language English
topic [SDU.OCEAN]Sciences of the Universe [physics]/Ocean
Atmosphere
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences
spellingShingle [SDU.OCEAN]Sciences of the Universe [physics]/Ocean
Atmosphere
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences
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 [SDU.OCEAN]Sciences of the Universe [physics]/Ocean
Atmosphere
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences
description International audience 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 ...
author2 Finnish Meteorological Institute (FMI)
Department of Physics
Okayama University
Swedish Institute of Space Physics Kiruna (IRF)
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 HAL CCSD
publishDate 2004
url https://hal.science/hal-00317398
https://hal.science/hal-00317398/document
https://hal.science/hal-00317398/file/angeo-22-1961-2004.pdf
geographic Longyearbyen
Svalbard
geographic_facet Longyearbyen
Svalbard
genre EISCAT
Longyearbyen
Svalbard
genre_facet EISCAT
Longyearbyen
Svalbard
op_source ISSN: 0992-7689
EISSN: 1432-0576
Annales Geophysicae
https://hal.science/hal-00317398
Annales Geophysicae, 2004, 22 (6), pp.1961-1971
op_relation hal-00317398
https://hal.science/hal-00317398
https://hal.science/hal-00317398/document
https://hal.science/hal-00317398/file/angeo-22-1961-2004.pdf
op_rights info:eu-repo/semantics/OpenAccess
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