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| Titel |
Retrieving the solar EUV spectrum from a reduced set of spectral lines |
| VerfasserIn |
T. Dudok Wit, J. Lilensten  , J. Aboudarham, P.-O. Amblard, M. Kretzschmar |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 23, no. 9 ; Nr. 23, no. 9 (2005-11-22), S.3055-3069 |
| Datensatznummer |
250015378
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| Publikation (Nr.) |
 copernicus.org/angeo-23-3055-2005.pdf |
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| Zusammenfassung |
| 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. |
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