Retrieving the solar EUV spectrum from a reduced set of spectral lines

The solar EUV irradiance is a key input for thermospheric and ionospheric models. Difficulties in continuously measuring the calibrated spectrum has prompted the use of various surrogate quantities. Although most proxies correlate quite well with the spectral variability, their use for modelling...

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Main Authors:	T. D. de Wit, J. Lilensten, J. Aboudarham, P.-O. Amblard, M. Kretzschmar
Format:	Article
Language:	English
Published:	Copernicus Publications 2005-11-01
Series:	Annales Geophysicae
Online Access:	https://www.ann-geophys.net/23/3055/2005/angeo-23-3055-2005.pdf

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spelling	doaj-3c4cd4f2b91240d6ae683aca5d3a9ecb2020-11-24T21:59:56ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05762005-11-01233055306910.5194/angeo-23-3055-2005Retrieving the solar EUV spectrum from a reduced set of spectral linesT. D. de Wit0J. Lilensten1J. Aboudarham2P.-O. Amblard3M. Kretzschmar4LPCE, CNRS and University of Orléans, 3A avenue de la Recherche Scientifique, 45 071 Orléans cedex 2, FranceLPG, CNRS and Joseph Fourier University, Bâtiment D de Physique, BP 53, 38 041 Saint-Martin d’Hères cedex 9, FranceLESIA, Paris Observatory, 5 Place Jules Janssen, 92 195 Meudon, FranceLIS, CNRS, 961 Rue de la Houille Blanche, BP 46, 38 402 St. Martin d’Hères cedex, FranceIFSI, INAF, Via del Fosso del Cavaliere, 00 133 Roma, ItalyThe solar EUV irradiance is a key input for thermospheric and ionospheric models. Difficulties in continuously measuring the calibrated spectrum has prompted the use of various surrogate quantities. Although most proxies correlate quite well with the spectral variability, their use for modelling purposes becomes increasingly unsatisfactory. A different and data-driven approach is considered here, in which the EUV spectrum is reconstructed from a linear combination of a few, calibrated and carefully selected spectral lines. This approach is based on a statistical analysis of the temporal variability of EUV spectra, as recorded by the TIMED satellite. A basic set of lines is extracted, from which the salient features of the spectral variability can be reconstructed. The best results are achieved with a selection of 5 to 8 of these lines. This study focuses on the methodology for selecting these lines, which can also be used for instrument specification and provides new insight into the comparison of solar proxies against the EUV irradiance.https://www.ann-geophys.net/23/3055/2005/angeo-23-3055-2005.pdf
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	T. D. de Wit J. Lilensten J. Aboudarham P.-O. Amblard M. Kretzschmar
spellingShingle	T. D. de Wit J. Lilensten J. Aboudarham P.-O. Amblard M. Kretzschmar Retrieving the solar EUV spectrum from a reduced set of spectral lines Annales Geophysicae
author_facet	T. D. de Wit J. Lilensten J. Aboudarham P.-O. Amblard M. Kretzschmar
author_sort	T. D. de Wit
title	Retrieving the solar EUV spectrum from a reduced set of spectral lines
title_short	Retrieving the solar EUV spectrum from a reduced set of spectral lines
title_full	Retrieving the solar EUV spectrum from a reduced set of spectral lines
title_fullStr	Retrieving the solar EUV spectrum from a reduced set of spectral lines
title_full_unstemmed	Retrieving the solar EUV spectrum from a reduced set of spectral lines
title_sort	retrieving the solar euv spectrum from a reduced set of spectral lines
publisher	Copernicus Publications
series	Annales Geophysicae
issn	0992-7689 1432-0576
publishDate	2005-11-01
description	The solar EUV irradiance is a key input for thermospheric and ionospheric models. Difficulties in continuously measuring the calibrated spectrum has prompted the use of various surrogate quantities. Although most proxies correlate quite well with the spectral variability, their use for modelling purposes becomes increasingly unsatisfactory. A different and data-driven approach is considered here, in which the EUV spectrum is reconstructed from a linear combination of a few, calibrated and carefully selected spectral lines. This approach is based on a statistical analysis of the temporal variability of EUV spectra, as recorded by the TIMED satellite. A basic set of lines is extracted, from which the salient features of the spectral variability can be reconstructed. The best results are achieved with a selection of 5 to 8 of these lines. This study focuses on the methodology for selecting these lines, which can also be used for instrument specification and provides new insight into the comparison of solar proxies against the EUV irradiance.
url	https://www.ann-geophys.net/23/3055/2005/angeo-23-3055-2005.pdf
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Retrieving the solar EUV spectrum from a reduced set of spectral lines

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