Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980azh....57..610s&link_type=abstract
(Astronomicheskii Zhurnal, vol. 57, May-June 1980, p. 610-620.) Soviet Astronomy, vol. 24, May-June 1980, p. 352-358. Translati
Astronomy and Astrophysics
Astronomy
1
Line Spectra, Sunspots, Umbras, Zeeman Effect, Solar Magnetic Field, Solar Spectra, Spectral Line Width
Scientific paper
The fine structure and Zeeman splitting of certain spectral lines in sunspot umbrae are studied. It is shown that unipolar sunspots pass through a stage when their umbrae contain light and dark sections consisting of light and dark fine-structure elements of different brightness, shape, and size. Bright fine-structure elements are concentrated in regions of the umbra lying in front of developing bays of the penumbra. It is found that in these regions of the umbra of a sunspot lying near the center of the solar disk the 6302.499 A Fe I and 5781.759 A CrI lines show a doublet, and in dark sections of the umbra a triplet pattern of splitting. The magnetic field strength is lower in light sections of an umbra than in dark sections.
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