Abstract
Observations of the Mgii h line in the umbrae of five sunspots show a spread of a factor of 3 in peak intensity. This range is larger than, and brackets, the range found in a single umbra by Lites and Skumanich (1982).
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Gurman, J.B. The Mg ii h line in sunspot umbrae. Sol Phys 90, 13–15 (1984). https://doi.org/10.1007/BF00153780
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DOI: https://doi.org/10.1007/BF00153780