Summary
According to the author the reason of the subsistence of the 11 years' sunspot cycle is to be found in the conjunction of the planets. As a result of the investigations it has been stated that from among the nine planets the joint tidal effect of Venus-Jupiter-Earth is a decisive factor in the variations of sunspot activity. The above three planets are every 10.4 years and 12.0 years respectively, in a close conjunction. The mean value (11.2 years) is in an almost full accordance with the average cycle-period. The fluctuations of the period of the cycle come from the fact that the planets' getting into approximately one line takes a different time within each cycle. This time delay is the cause of the stronger or weaker sunspot activity, and of the shorter or longer cycles.
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References
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Németh, T. An attempt to the explanation and to the prediction of the eleven-year cycle of solar activity. PAGEOPH 63, 205–210 (1966). https://doi.org/10.1007/BF00875170
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DOI: https://doi.org/10.1007/BF00875170