Abstract
Long-term variations of solar activity during the last thousand years were derived from historical observations (by the naked eye) of large sunspots and from records of auroras at latitudes < 55°. The results shown in Figure 1 indicate very good agreement as regards the occurrence of maxima and minima of all three indices (sunspots, auroras, 14C), and even between secondary fluctuations of the 14C-curve, which were usually neglected in the presentation of the smoothed curve.
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Křivský, L. Long-term fluctuations of solar activity during the last thousand years. Sol Phys 93, 189–194 (1984). https://doi.org/10.1007/BF00156664
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DOI: https://doi.org/10.1007/BF00156664