Unusual activity of the Sun during recent decades compared to the previous 11,000 years

@article{Solanki2004UnusualAO,
  title={Unusual activity of the Sun during recent decades compared to the previous 11,000 years},
  author={S. Solanki and I. Usoskin and B. Kromer and M. Sch{\"u}ssler and J. Beer},
  journal={Nature},
  year={2004},
  volume={431},
  pages={1084-1087}
}
Direct observations of sunspot numbers are available for the past four centuries, but longer time series are required, for example, for the identification of a possible solar influence on climate and for testing models of the solar dynamo. Here we report a reconstruction of the sunspot number covering the past 11,400 years, based on dendrochronologically dated radiocarbon concentrations. We combine physics-based models for each of the processes connecting the radiocarbon concentration with… Expand

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