Uncombed fields as the source of the broad-band circular polarization of sunspots

Details Uncombed fields as the source of the broad-band circular polarization of sunspots Uncombed fields as the source of the broad-band circular polarization of sunspots

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...275..283s&link_type=abstract

Astronomy and Astrophysics, Vol. 275, p. 283 (1993)

Astronomy and Astrophysics

Astrophysics

169

Sun: Sunspots, Sun: Magnetic Fields

Scientific paper

We investigate the production of broad-band circular polarization (BBC) of sunspots using a model inspired by the discovery of small-scale variations of magnetic inclination in sunspot penumbrae. The proposed model is a simple representation of a horizontal magnetic flux tube embedded in an inclined magnetic field, with a flow in either one or both components (Evershed flow). This model is shown to produce a sizable BBC without requiring substantial net vertical gradients of the magnetic vector. It reproduces the BBC observations in a qualitatively correct and quantitatively acceptable manner for reasonable values of its free parameters. In addition, our model also explains the crossover effect observed in sunspot penumbrae. The fits to the observations support the presence of a larger velocity in the horizontal magnetic filaments than in the inclined field. We point out that the BBC is complementary to high resolution images in that it diagnoses the height variation of the small-scale structure of sunspot magnetic fields. By combining the results from both techniques we outline the 3-D fine-scale structure of the magnetic field in the photospheric layers of sunspot penumbrae. The most important result is that the two differently inclined components of the field do not simply form vertical sheets, but rather must have a horizontal interface near the level of line formation.

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