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We show a selection of high-sensitivity spectropolarimetric observationsobtained over the last few years in the Ba II D2-line with the Zurich ImagingPolarimeter (ZIMPOL) attached to the Gregory Coude Telescope of IRSOL. Themeasurements were collected close to the solar limb, in several regions withvarying degree of magnetic activity. The Stokes profiles we have observed showclear signatures of the joint action of the Hanle and Zeeman effects, in verygood qualitative agreement with the theoretical expectations. Polarimetricmeasurements of this line show to be very well suited for magnetic fielddiagnostics of the lower solar chromosphere, from regions with fieldintensities as low as 1 gauss to strongly magnetized ones having kG fieldstrengths.

Observations of the Joint Action of the Hanle and Zeeman Effects in the D2 Line of BaII