Quiet Sun magnetic fieldsand the Total Solar Irradience (TSI)

Roald Schnerr (Stockholm)Henk Spruit (MPIA)

TSI and the Solar cycle

Fröhlich et al.

Magnetic fields and irradience

Sheeley & Warren 2006

Magnetic field

Intensity

Start EndSolar max

TSI predictions from synoptic data

Wenzler et al 2004

IntensityMagnetic field

Free parameter: facular filling factor

TSI modelling

Wenzler et al 2004

Quiet Sun fields

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

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

Magnetic field statistics

Intensity vs B field, corrected for the “dark lane effect”

SST active region Hinode Quiet Sun

Resolution vs TSI prediction

Resolution Contrast (<50 G) ΔΦ ΔI

SST active region

SST 7.3% - -

Hinode 7.0% -0.51% +0.04%

1.14” 4.2% -2.03% +0.3%

Hinode Quiet Sun

Hinode 7.7% - -

1.14” 7.1% -17.7% -0.5%

Thanks!

Sneak preview