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

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

2009-06-12

arxiv.org/abs/0906.2320v1

ASP Conf. Ser. Vol. 405, 2009, p. 41

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

6 pages, 6 figures, presented at Solar Polarization Workshop 5, held in Ascona, Switzerland, 17-21 September 2007

Scientific paper

We show a selection of high-sensitivity spectropolarimetric observations obtained over the last few years in the Ba II D2-line with the Zurich Imaging Polarimeter (ZIMPOL) attached to the Gregory Coude Telescope of IRSOL. The measurements were collected close to the solar limb, in several regions with varying degree of magnetic activity. The Stokes profiles we have observed show clear signatures of the joint action of the Hanle and Zeeman effects, in very good qualitative agreement with the theoretical expectations. Polarimetric measurements of this line show to be very well suited for magnetic field diagnostics of the lower solar chromosphere, from regions with field intensities as low as 1 gauss to strongly magnetized ones having kG field strengths.

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