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Precise polarimetry is very important for studying the characteristics and evolution of solar magnetic fields. We focus on the intensity to linear and circular polarization crosstalk that affect polarimetric accuracy of full-disk vector magnetic-field measurements. An attempt is made to correct such crosstalk and to reconstruct full-disk vector magnetic fields from polarization data. By analyzing...
Zhao and Kosovichev (Astrophys. J.591, 446, 2003) found two opposite sub-photospheric vortical flows in the depth range of 0 – 12 Mm around a fast rotating sunspot. So far there is no theoretical model explaining such flow motions. In this paper, we try to explain this phenomenon from the point of view of magnetic flux tubes interacting with large-scale vortical motions of plasma. In the deeper zone...
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