Magnetic field measurements on the sun and implications for stellar magnetic field observations

Details Magnetic field measurements on the sun and implications for stellar magnetic field observations Magnetic field measurements on the sun and implications for stellar magnetic field observations

Jan 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...312..930s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 312, Jan. 15, 1987, p. 930-942.

Astronomy and Astrophysics

Astrophysics

12

Magnetic Measurement, Solar Magnetic Field, Stellar Magnetic Fields, Stellar Spectrophotometry, Faculae, Fourier Analysis, Infrared Spectra, Line Shape, Sunspots, Zeeman Effect

Scientific paper

Results of solar magnetic field measurements in plages, sunspot umbrae, and sunspot penumbrae using high spectral resolution, unpolarized infrared H band spectral data are presented. A Fourier deconvolution analysis scheme similar to that utilized for stellar magnetic field measurements is adopted. As an example, a field strength of 3240 + or - 450 G is determined in a sunspot umbra combined with a value of 2000 + or - 180 G in the associated penumbra. These values are compared with a direct measurement of the spot umbra and penumbra field strengths based on the observed separation of the Zeeman components of the magnetically sensitive lines. Possible origins for the discrepancy between the results inferred by these two different techniques are discussed. The Fourier analysis results confirm the widespread occurrence of kilogauss level fields in the solar photosphere. The implications of the solar results for stellar magnetic field measurements are considered.

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