D.Sokoloff, E.Illarionov, Cluster analysis for solar butterfly diagrams, Межд. конф. Теория вероятностей и ее приложения, посв. 100-летию Б.В.Гнеденко, Тезисы докл., М., URSS, 2012, с. 135 - 136.

We investigate to what extent the wings of solar butterfly diagrams can be separated without an explicit usage of Hale’s polarity law as well as the location of the solar equator. We apply two algorithms of cluster analysis for this purpose, namely DBSCAN and C- means, and demonstrate their ability to separate the wings of contemporary butterfly diagrams based on the sunspot group density in the diagram only.

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Текст: http://www.math.msu.su/department/probab/gnedenko100.pdf