"According to our reconstruction, the level of solar activity over the past 70 years has been exceptional, and the previous period of equally high activity occurred more than 8000 years ago." Read the October 2004 Nature paper here.
And also see Muscheler, R., Joos, F., Beer, J., Mueller, S.A., Vonmoos, M., Snowball, I., 2007. Solar activity during the last 1000 yr inferred from radionuclide records for the reconstruction below:
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