Abstract
The presence of a magnetic field at different levels inside the Sun has crucial implications for helioseismology. The solar oscillation observing program carried out since 1983 at Mt. Wilson with Cacciani magneto-optical filter (MOF) has recently been modified to acquire full-disk magnetograms with 2 arcsec spatial resolution. We present here a method for the correct determination of magnetic maps which are free of contamination by velocity signal. We show that no cross-talk exists between the Doppler and Zeeman shifts of the NaD lines, provided that instrumental polarization effects are taken into account. We also used the observed line-ofsight photospheric field to map the vector field in the inner corona, above active regions, in the «current free» approximation.
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