Abstract
The joint consideration of theoretical and observational arguments is used to conclude that two different spot populations co-exist in the Sun.
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Proceedings of the 14th ESLAB Symposium on Physics of Solar Variations, 16–19 September 1980, Scheveningen, The Netherlands.
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De La Rosa, J.I.G. Sunspot populations and their relation with the solar cycle. Sol Phys 74, 117–123 (1981). https://doi.org/10.1007/BF00151281
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DOI: https://doi.org/10.1007/BF00151281