Solar radiation variability spans a wide range in time, ranging from seconds to decadal and longer. The nearly 40 years of measurements of solar irradiance from space established that the total solar irradiance varies by ≈0.1 % in phase with the Sun's magnetic cycle. Specific intervals of the solar spectrum, e.g., ultraviolet (UV), vary by orders of magnitude more. These variations can affect the Earth's climate in a complex non-linear way. Specifically, some of the processes of interaction between solar UV radiation and the Earth's atmosphere involve threshold processes and do not require a detailed reconstruction of the solar spectrum. For this reason a spectral UV index based on the (FUV-MUV) color has been recently introduced. This color is calculated using SORCE SOLSTICE integrated fluxes in the FUV and MUV bands. We present in this work the reconstructions of the solar (FUV-MUV) color and Ca uc(ii) K and Mg uc(ii) indices, from 1749-2015, using a semi-empirical approach based on the reconstruction of the area coverage of different solar magnetic features, i.e., sunspot, faculae and network. We remark that our results are in noteworthy agreement with latest solar UV proxy reconstructions that exploit more sophisticated techniques requiring historical full-disk observations. This makes us confident that our technique can represent an alternative approach which can complement classical solar reconstruction efforts. Moreover, this technique, based on broad-band observations, can be utilized to estimate the activity on Sun-like stars, that cannot be resolved spatially, hosting extra-solar planetary systems.

Berrilli, F., Criscuoli, S., Penza, V., Lovric, M. (2020). Long-term (1749–2015) Variations of Solar UV Spectral Indices. SOLAR PHYSICS, 295(3) [10.1007/s11207-020-01603-5].

Long-term (1749–2015) Variations of Solar UV Spectral Indices

Berrilli F.
Supervision
;
Criscuoli S.
Investigation
;
Penza V.
Data Curation
;
2020-01-01

Abstract

Solar radiation variability spans a wide range in time, ranging from seconds to decadal and longer. The nearly 40 years of measurements of solar irradiance from space established that the total solar irradiance varies by ≈0.1 % in phase with the Sun's magnetic cycle. Specific intervals of the solar spectrum, e.g., ultraviolet (UV), vary by orders of magnitude more. These variations can affect the Earth's climate in a complex non-linear way. Specifically, some of the processes of interaction between solar UV radiation and the Earth's atmosphere involve threshold processes and do not require a detailed reconstruction of the solar spectrum. For this reason a spectral UV index based on the (FUV-MUV) color has been recently introduced. This color is calculated using SORCE SOLSTICE integrated fluxes in the FUV and MUV bands. We present in this work the reconstructions of the solar (FUV-MUV) color and Ca uc(ii) K and Mg uc(ii) indices, from 1749-2015, using a semi-empirical approach based on the reconstruction of the area coverage of different solar magnetic features, i.e., sunspot, faculae and network. We remark that our results are in noteworthy agreement with latest solar UV proxy reconstructions that exploit more sophisticated techniques requiring historical full-disk observations. This makes us confident that our technique can represent an alternative approach which can complement classical solar reconstruction efforts. Moreover, this technique, based on broad-band observations, can be utilized to estimate the activity on Sun-like stars, that cannot be resolved spatially, hosting extra-solar planetary systems.
2020
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/06 - FISICA PER IL SISTEMA TERRA E PER IL MEZZO CIRCUMTERRESTRE
English
Sun: activity; Sun: UV radiation; Sun: faculae; plages
https://link.springer.com/article/10.1007/s11207-020-01603-5
https://doi.org/10.1007/s11207-020-01603-5
Berrilli, F., Criscuoli, S., Penza, V., Lovric, M. (2020). Long-term (1749–2015) Variations of Solar UV Spectral Indices. SOLAR PHYSICS, 295(3) [10.1007/s11207-020-01603-5].
Berrilli, F; Criscuoli, S; Penza, V; Lovric, M
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/240665
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