On the generation of the net circular polarization observed in solar faculae

Details On the generation of the net circular polarization observed in solar faculae On the generation of the net circular polarization observed in solar faculae

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...222..311s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 222, no. 1-2, Sept. 1989, p. 311-315. Research supported by CAICYT.

Astronomy and Astrophysics

Astrophysics

33

Circular Polarization, Faculae, Photosphere, Solar Magnetic Field, Line Spectra, Signal To Noise Ratios, Stokes Law Of Radiation, Velocity Distribution

Scientific paper

The net circular polarization observed in solar faculae (Stenflo et al., 1984) follows a law expected from the combination of velocity and magnetic field gradients in the photosphere. To show this, the theoretical curve of growth (net circular polarization produced by a single line versus its absorption coefficient) predicted by this mechanism is developed. An empirical curve of growth with more than 80 Fe I lines is also constructed. The agreement between theory and observation seems to point toward this mechanism as responsible for circular polarization in faculae at the disk center.

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