On the inference of magnetic field vectors from Stokes profiles

Details On the inference of magnetic field vectors from Stokes profiles On the inference of magnetic field vectors from Stokes profiles

May 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...372..694j&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 372, May 10, 1991, p. 694-702.

Astronomy and Astrophysics

Astrophysics

41

Line Spectra, Magnetic Field Configurations, Polarimeters, Solar Magnetic Field, Solar Spectra, Visible Spectrum, Zeeman Effect

Scientific paper

A study is made of the range of applicability of the weak-field approximation for the inference of magnetic field vectors from the profiles of the Stokes parameters. It is shown that, for typical solar lines in the visible, this approximation may be applied with an accuracy of 20 percent for field strengths as great as 3500/gL G (where gL is the Lande factor) in the line wings. A systematic underestimate of the field strength seems to occur for strong fields - observations in several related spectral lines may allow a calibration of this effect, and so for an increase in accuracy of the inferences. The procedures have been tested using solar data obtained in two lines of Fe I, near 6300 A, with the Stokes Polarimeter at the Mees Solar Observatory of the University of Hawaii.

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