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Cluster analysis for pattern recognition in solar butterfly diagrams. E. Illarionov , D. Sokoloff , R. Arlt, and A . Khlystova. Two algorithms of cluster analysis, DBSCAN and C-mean, able to separate the wings of contemporary butterfly diagrams.
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Cluster analysis for pattern recognition in solar butterfly diagrams E. Illarionov, D. Sokoloff, R. Arlt, andA. Khlystova • Two algorithms of cluster analysis, DBSCAN and C-mean, able to separate the wings of contemporary butterfly diagrams • Application to historical data of the XVIII century • Cycle 21: (1) – DBSCAN, (2) – C-mean. Green and blue colors indicate the clusters, red is for sunspot groups which do not belong to any cluster 1 2