Modelling the rotational modulation of the total solar irradiance as observed by VIRGO on SoHO

Details Modelling the rotational modulation of the total solar irradiance as observed by VIRGO on SoHO Modelling the rotational modulation of the total solar irradiance as observed by VIRGO on SoHO

Jan 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004esasp.538..343l&link_type=abstract

In: Second Eddington Workshop: Stellar structure and habitable planet finding, 9 - 11 April 2003, Palermo, Italy. Edited by F. F

Physics

Sun: Variability, Sun: Activity, Sun: Rotational Modulation, Exoplanets: Transits

Scientific paper

We present a technique to model the modulation of the solar bolometric flux produced by the rotation of the active regions (for a full account see Lanza et al. 2003). Each active region is modelled as a combination of cool spots and bright faculae, the contrast factors of which are assumed to be constant. By assuming that three active regions are simultaneously present on the solar surface, our method proved capable of modelling the variability of the total solar irradiance (TSI) as observed by VIRGO/SoHO on time scales going from ~5 days up to the solar cycle. The relative amplitude of the residuals is of the order of (1-2)×10-4 with the largest values observed during the phases of maximum solar activity of cycle 23. The application of a similar technique to solar-like stars, such as those that will be observed by Eddington, COROT and Kepler, should allow us to obtain information on stellar rotation and the pattern of active regions as well as on the activity cycle, if a suffciently long data sequence is available. Moreover, the proposed approach may be applied to reduce significantly the impact of stellar variability arising from magnetic activity on planetary transit detection.

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