Interpretation of broad band circular polarization measurements using Stokes V spectra

Details Interpretation of broad band circular polarization measurements using Stokes V spectra Interpretation of broad band circular polarization measurements using Stokes V spectra

Oct 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...204..279m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 204, no. 1-2, Oct. 1988, p. 279-285.

Astronomy and Astrophysics

Astrophysics

11

Circular Polarization, Polarized Light, Solar Activity, Solar Magnetic Field, Stokes Law Of Radiation, Broadband, Fourier Transformation, Spatial Resolution, Spectrum Analysis, Sunspots

Scientific paper

The wavelength dependence and the center to limb variation of the broad band circular polarization of solar active regions are determined by integrating over spectra with a large wavelength range obtained with a Fourier transform spectrometer (FTS). It is shown that the broad band circular polarization (BBC) is due mainly to the asymmetry of the Stokes V profiles. The approximate contributions of lines of different depths to the total broad band signal are analyzed. The diagnostic contents of BBC observations with low spatial resolution, such as those of Kemp et al. (1987), are discussed. These observations are reproduced with the help of simulated broad band polarization data obtained by integrating FTS spectra. It is shown that the spatial distribution of the net field on the solar surface (within a single large spatial resolution element) can affect the measured BBC signal considerably, and may even change its sign.

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