1. Quiet Sun magnetic fields and the Total Solar Irradience (TSI) Roald Schnerr (Stockholm) Henk Spruit (MPIA)

2. TSI and the Solar cycle Fröhlich et al.

4. Magnetic fields and irradience Sheeley & Warren 2006 Magnetic field Intensity Start End Solar max

5. TSI predictions from synoptic data Wenzler et al 2004 IntensityMagnetic field Free parameter: facular filling factor

6. TSI modelling Wenzler et al 2004

7. Quiet Sun fields MHD sims of Quiet Sun with different B (Vögler 2005)

8. Colours: [B,G,R] = [80<B<400, 400<B<700, B>700] (SST) [B,G,R] = [30<B<250, 250<B<650, B>650] (Hinode) SST & Hinode

9. Magnetic field statistics Intensity vs B field, corrected for the “dark lane effect” SST active regionHinode Quiet Sun

10. Resolution vs TSI prediction ResolutionContrast (<50 G)ΔΦΔIΔI SST active region SST7.3%-- Hinode7.0%-0.51%+0.04% 1.14”4.2%-2.03%+0.3% Hinode Quiet Sun Hinode7.7%-- 1.14”7.1%-17.7%-0.5%

11. Thanks!

12. B field histogram Intensity contr vs B fieldAdditional contribution of magnetic regions is ~2% (Hinode >50G) and 11% (SST > 200 G)

13. Sneak preview