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| Titel |
Reconstruction of total and spectral solar irradiance in the satellite era |
| VerfasserIn |
Kok Leng Yeo, Natalie Krivova, Sami Solanki |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250088385
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| Publikation (Nr.) |
 EGU/EGU2014-2486.pdf |
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| Zusammenfassung |
| Total and spectral solar irradiance are key to understanding the influence of the Sun on
changes in the Earth’s climate, and also represent a useful index of solar activity from the
apparent relationship with solar magnetism. We present a SATIRE-S model reconstruction of
total and spectral solar irradiance spanning the period of 1974 to 2013. The model ascribes
variation in solar irradiance, on timescales greater than a day, to the occurrence and evolution
of magnetic structures on the photosphere. This is an update of preceding efforts with
the model based on full disc magnetograms from the KPVT and SoHO/MDI. We
extended the model to the present with similar observations from SDO/HMI, and cross
calibrated the various magnetogram data sets to yield a single, consistent solar
irradiance time series. The decadal trend in the PMOD composite record of total solar
irradiance is almost exactly reproduced, giving support to solar surface magnetism as a
driver of secular variation in solar irradiance. The reconstruction exhibits excellent
agreement with various measurements of spectral solar irradiance (R2 -³ 0.9) but
diverge significantly from the observations from SORCE/SIM, adding to existing
evidence that SIM measurements might contain unresolved instrumental trends. |
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