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

Solanki SK, Usoskin IG, Kromer B, Schüssler M & Beer J
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Solanki, S. K., Usoskin, I. G., Kromer, B., Schüssler, M., & Beer, J. (2004). Unusual activity of the Sun during recent decades compared to the previous 11,000 years. Nature, 431, 1084-1087. https://doi.org/10.1038/nature02995