Abstract
THE values of the time of rise corresponding to the successive sunspot cycles do not seem to show periodicity1. If we consider, however, the values of the time of rise for the cycles of the same polarity, that is, the cycles corresponding to the odd and even values of the current number N separately, we find a more or less clear tendency for the minima of the time of rise to recur every eight cycles for cycles with N = 2K +1 and every ten cycles for cycles with N = 2K, K = 0, ± 1, ± 2, ….
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References
Xanthakis, J., Nature, 210, 1242 (1966).
Waldmeier, M., The Sunspot Activity in the Years 1610–1960 (Zurich, 1961).
Xanthakis, J., Bull. of the Astron. Inst. Czech., 17, No. 5 (1966).
King-Hele, D. G., Nature, 209, 285 (1966).
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XANTHAKIS, J. Probable Values of the Time of Rise for the Forthcoming Sunspot Cycles. Nature 215, 1046–1048 (1967). https://doi.org/10.1038/2151046a0
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DOI: https://doi.org/10.1038/2151046a0
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