Annual sunspot numbers for 1-969 CE show 91 cycles averaging 10.6 years long, including a grand minimum around 650-730 CE and an extreme event in 774 CE.
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Cyclic sunspot activity during the first millennium CE as reconstructed from radiocarbon
Annual sunspot numbers for 1-969 CE show 91 cycles averaging 10.6 years long, including a grand minimum around 650-730 CE and an extreme event in 774 CE.