Researchers report spikes in the concentrations of the cosmogenic radionuclides beryllium-10 and chlorine-36 measured in two Greenland ice cores consistent with a strong solar storm having occurred around 660 BC, only the third such storm documented; the authors estimate that the storm was an order of magnitude stronger than any instrumentally recorded solar event.
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Article #18-15725: "Multiradionuclide evidence for an extreme solar proton event around 2,610 B.P. (?660 BC)," by Paschal O'Hare et al.
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