Physics
Scientific paper
Sep 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.535...53l&link_type=abstract
In: Solar variability as an input to the Earth's environment. International Solar Cycle Studies (ISCS) Symposium, 23 - 28 June 2
Physics
1
Irradiance, Solar Diameter, Sunspots, Faculae, Singular Spectrum Analysis
Scientific paper
Since the pioneer work of S. Sofia on the relationship between changes in the solar radius and the corresponding changes in the solar constant I, it is now known that a key parameter to model effects of the Sun on the Earth's climate is the so-called parameter W. This parameter, which is the ratio between the relative variations of the radius over the relative variations of the solar constant, is not yet known with a great accuracy. Modelling I, is thus essential. Several models have been so far proposed, the most popular being a model based on a ponderate function of spots and faculae areas distribution. However the totality of the irradiance variations are not reproduced, a few percent being left by current models. In this paper, we will focus on the non explained part of the luminosity variations. We show that a variability of 200 mas of amplitude will reproduce the observed irradiance trend. Such a high value is unlikely; however a 10 mas of amplitude is still visible in the trend. To conclude, simultaneous measurements of the irradiance and the solar radius have to be made through dedicated satellites, such as the PICARD mission, expected in a near future.
Lefebvre Sandrine
Rozelot Jean-Pierre
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