Resonance polarization of the solar 455.4 nm BaII line: diagnostics of chromospheric magnetic fields

Details Resonance polarization of the solar 455.4 nm BaII line: diagnostics of chromospheric magnetic fields Resonance polarization of the solar 455.4 nm BaII line: diagnostics of chromospheric magnetic fields

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sf2a.conf..601m&link_type=abstract

SF2A-2007: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics held in Grenoble, France, July

Astronomy and Astrophysics

Astrophysics

Scientific paper

The BaII resonance line at 455.4 nm is formed in the low solar chromopshere. It is significantly linearly polarized outside active regions and close to the solar limb. This so-called resonance polarization is sensitive to the Hanle effect of weak magnetic fields. We report on numerical simulations of the intensity and resonance polarization profiles in the line and in the adjacent continuum, in the quiet solar atmosphere and we compare them to observations performed at the Jean Rosch refractor at the Pic du Midi Observatory. In the simulations we take into account non-LTE multilevel coupling, multiple scattering and partial frequency redistribution, and we neglect the hyperfine structure of the odd isotopes. This allows to model the central part of the line core and the wings quite well. Then we investigate the diagnostic potential of the line core polarization for weak unresolved magnetic fields in the low chromosphere. We find that the observed polarization rates are in good agreement with the simulations if we take into account the Hanle effect of weak magnetic fields on the order of 60 to 75 Gauss.

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