On the umbra-penumbra area ratio of sunspots
- 1 September 1990
- journal article
- Published by Springer Science and Business Media LLC in Solar Physics
- Vol. 129 (1), 191-194
- https://doi.org/10.1007/bf00154373
Abstract
No abstract availableKeywords
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- The Area of a Sun-Spot and the Intensity of Its Magnetic FieldPublications of the Astronomical Society of the Pacific, 1933