Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984acasn..25..234j&link_type=abstract
(Acta Astronomica Sinica, vol. 25, no. 3, 1984, p. 234-240) Chinese Astronomy and Astrophysics (ISSN 0275-1062), vol. 9, March 1
Astronomy and Astrophysics
Astrophysics
Magnetic Measurement, Solar Magnetic Field, Sunspots, Atmospheric Models, Polarizers, Stokes Law Of Radiation
Scientific paper
Formulas for the calculation of the magnitude H and the inclination gamma of sunspot magnetic fields from observations obtained with an instrument comprising only a quarter-wave plate and two orthogonal polarizers fixed at + and - 45 deg to the plate fast axis are derived. The method is shown to be less sensitive than the Stoke-parameter-profile technique to the type of sunspot atmosphere model employed. The use of the standard formula for determining H from the wavelength shift, delta lambda = 0.0000467 gH(lambda squared), is considered, and the significant relative errors involved at various values of H and gamma are given in a table.
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