Presented is the AD 969 chronicle of carbon. Actually from 4 January. "Solar" activity but this may incorporate supernovae, as well.
This confirms the 11 year sunspot cycle. It has netted also the AD 993 spike. Two more spikes are found AD 1052 and 1279, which should be of interest to historians, because we're well into the High Middle Ages now...
They say it's all already included in IntCal20. It might be of interest that AD 1052 is just two years before the Crab Nebula was visible.
BACKDATE 1/19: Press release. I do not know why we did not get this 4 January when Nature Geoscience published.
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