The effect of line damping, magneto-optics and parasitic light on the derivation of sunspot vector magnetic fields

Details The effect of line damping, magneto-optics and parasitic light on the derivation of sunspot vector magnetic fields The effect of line damping, magneto-optics and parasitic light on the derivation of sunspot vector magnetic fields

May 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985svmf.nasa..341s&link_type=abstract

In NASA. Marshall Space Flight Center Meas. of Solar Vector Magnetic Fields p 341 (SEE N85-29869 18-92)

Physics

Optics

Damping, Least Squares Method, Line Spectra, Solar Magnetic Field, Stokes Law Of Radiation, Sunspots, Magneto-Optics, Vectors (Mathematics), Zeeman Effect

Scientific paper

The least square fitting of Stokes observations of sunspots using a Milne-Eddington-Unno model appears to lead, in many circumstances, to various inconsistencies such as anomalously large doppler widths and, hence, small magnetic fields which are significantly below those inferred solely from the Zeeman splitting in the intensity profile. It is found that the introduction of additional physics into the model such as the inclusion of damping wings and magneto-optic birefrigence significantly improves the fit to Stokes parameters. Model fits excluding the intensity profile, i.e., of both magnitude as well as spectral shape of the polarization parameters alone, suggest that parasitic light in the intensity profile may also be a source of inconsistencies. The consequences of the physical changes on the vector properties of the field derived from the Fe I lambda 6173 line for the 17 November 1975 spot as well as on the thermodynamic state are discussed. A Doppler width delta lambda (D) - 25mA is bound to be consistent with a low spot temperature and microturbulence, and a damping constant of a = 0.2.

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