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Foukal2004

Improved reconstruction of total solar irradiance using broad- band facular contrast measurements from the Solar Bolometric Imager (SBI). The SBI images the solar photosphere with non- selective spectral response over the range 0.2 – 2.6 micron i.e. 94% of the total solar irradiance (TSI).

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Foukal2004

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  1. Improved reconstruction of total solar irradiance using broad- band facular contrast measurements from the Solar Bolometric Imager(SBI) • The SBI images the solar photosphere with non- selective spectral response over the range 0.2 – 2.6 micron i.e. 94% of the total solar irradiance (TSI). • The first broad-band measurements of facular contrast were obtained during the first SBI flight on Sept 1 2003 ( Foukal et al., Ap.J. Letts, 611,57,2004). • SBI is scheduled for re-flight from Antarctica in late 2006.

  2. SBI facular contrast (left panel) used to reconstruct TSI with no free parameters (right panel) for the first time (Foukal et al.,Ap.J.,submitted,Dec 2005). Note agreement in TSI variation amplitude between reconstruction and VIRGO radiometry, to better than +/-10% rms. This agreement indicates little contribution to TSI variation from Teff variations outside spots and faculae (e.g. “magnetic stirring”). It also supports the thermal impedance model of TSI variation over other mechanisms such as magnetic storage or downdrafts.

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