Physics
Scientific paper
Apr 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976soph...47..563t&link_type=abstract
Solar Physics, vol. 47, Apr. 1976, p. 563-573. Research supported by the Lockheed Independent Research Funds;
Physics
8
Absorption Spectra, Fourier Transformation, Line Spectra, Solar Magnetic Field, Calibrating, Error Analysis, Random Errors, Sunspots, Zeeman Effect
Scientific paper
Fourier techniques have been exhaustively calibrated using Unno's (1956) results for the absorption profile of a simple Zeeman triplet. If a simple transformation is applied to the normalized line depths, then magnetic-field strengths and inclination angles can be measured very accurately from noisy saturated line profiles. Systematic errors caused by saturation effects can be estimated and reduced by varying one parameter. When a significant fraction of the line profile is unsplit and unpolarized, large errors may be made in measurements of low fields, unless the line is sufficiently weak. For a weak line, a vertical field of 1600 gauss can be measured to 10% accuracy even when 70% of the line profile is stray light. These stray-light errors are troublesome in measuring fields of gaps and pores but not sunspots. Numerical results of the error analysis are presented graphically.
Tarbell Ted D.
Title Alan M.
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