Journal
ASTRONOMY & ASTROPHYSICS
Volume 436, Issue 2, Pages L27-L30Publisher
E D P SCIENCES
DOI: 10.1051/0004-6361:200500114
Keywords
sun : MHD; sun : magnetic fields; sun : infrared; sun : polarization
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We report a direct comparison of the amplitudes of Stokes spectra of the Fe. 630 nm and 1.56 mu m lines produced by realistic MHD simulations with simultaneous observations in the same spectral regions. The Stokes spectra were synthesized in snapshots with a mixed polarity magnetic field having a spatially averaged strength, < B >, between 10 and 30 G. The distribution, of Stokes V amplitudes depends sensitively on < B >. A quiet inter-network region was observed at the German VTT simultaneously with TIP (1.56 mu m) and POLIS (630 nm). We find that the Stokes V amplitudes of both infrared and visible observations are best reproduced by the simulation snapshot with < B > = 20 G. In observations with 1'' resolution, up to 2/3 of the magnetic flux can remain undetected.
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