Abstract
ALTHOUGH astronomers have commonly believed that sunspots are deep-seated vortices, the chief characteristics of a spot (an intense magnetic field and a cool umbra) have never been successfully explained.
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MENZEL, D. Origin of Sunspots. Nature 166, 31–32 (1950). https://doi.org/10.1038/166031b0
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DOI: https://doi.org/10.1038/166031b0
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