Zeeman splitting of spectral lines in different structural elements of sunspot umbrae

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 lambda6302.499 A Fe I and lambda5781.759 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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