Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011sf2a.conf..401m&link_type=abstract
SF2A-2011: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics Eds.: G. Alecian, K. Belkacem,
Astronomy and Astrophysics
Astrophysics
Line: Formation, Techniques: Spectroscopic, Sun: Photosphere, Sun: Magnetic Fields
Scientific paper
Molecular lines formed in the upper photosphere of the Sun show linear scattering polarization, when one observes close to the solar limb. This provides us with a diagnostic tool for measuring weak magnetic fields in the solar photosphere through the differential Hanle effect in these lines. However, in order to interpret polarization ratio measured in different lines of different optical thickness, one has to model accurately enough the line formation processes. Observations performed close to and above the solar limb give access to the still poorly known region of the temperature minimum between the photosphere and the chromosphere. The modeling of such observations requires to account for the spherical geometry of the solar atmosphere. Here we revisit the modeling of molecular solar line scattering polarization in spherical geometry and we investigate its diagnostics potential.
Faurobert Marianne
Milic I.
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