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Retrieving the Solar Euv Spectrum from a Reduced Set of Spectral Lines : Volume 23, Issue 9 (22/11/2005)

By De Wit, T. Dudok

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Book Id: WPLBN0003976851
Format Type: PDF Article :
File Size: Pages 15
Reproduction Date: 2015

Title: Retrieving the Solar Euv Spectrum from a Reduced Set of Spectral Lines : Volume 23, Issue 9 (22/11/2005)  
Author: De Wit, T. Dudok
Volume: Vol. 23, Issue 9
Language: English
Subject: Science, Annales, Geophysicae
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Aboudarham, J., Lilensten, J., Kretzschmar, M., De Wit, T. D., & Amblard, P. (2005). Retrieving the Solar Euv Spectrum from a Reduced Set of Spectral Lines : Volume 23, Issue 9 (22/11/2005). Retrieved from

Description: LPCE, CNRS and University of Orléans, 3A avenue de la Recherche Scientifique, 45 071 Orléans cedex 2, France. 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.

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


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