Figure 2 (IMAGE)

Nagoya University

Figure 2

Caption

Based on Kepler’s observation, researchers suggested the cycle-boundary range between Solar Cycles −14 and −13 as indicated in red lines, in comparison with the sunspot (group) number reconstructions based on the sunspot records in blue curve (Svalgaard & Schatten, 2016) and tree-ring 14C data in black curve (Usoskin et al., 2021) and green curve (Miyahara et al., 2021). The authors' reconstruction contradicts controversial claim that an extremely short and an extremely lengthened solar cycles (green) and conforms to the regular solar cycles (black).

Credit

Dr. Hisashi Hayakawa

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