A signature of cosmic-ray increase in ad 774–775 from tree rings in Japan

@article{Miyake2012ASO,
  title={A signature of cosmic-ray increase in ad 774–775 from tree rings in Japan},
  author={Fusa Miyake and Kentaro Nagaya and Kimiaki Masuda and Toshio Nakamura},
  journal={Nature},
  year={2012},
  volume={486},
  pages={240-242}
}
Increases in 14C concentrations in tree rings could be attributed to cosmic-ray events, as have increases in 10Be and nitrate in ice cores. The record of the past 3,000 years in the IntCal09 data set, which is a time series at 5-year intervals describing the 14C content of trees over a period of approximately 10,000 years, shows three periods during which 14C increased at a rate greater than 3‰ over 10 years. Two of these periods have been measured at high time resolution, but neither showed… 
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SEARCH FOR ANNUAL 14 C EXCURSIONS IN THE PAST
Two radiocarbon excursions (AD 774–775 and AD 993–994) occurred due to an increase of incoming cosmic rays on a short timescale. The most plausible cause of these events is considered to be extreme
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Abstract Two radiocarbon excursions (AD 774–775 and AD 993–994) occurred due to an increase of incoming cosmic rays on a short timescale. The most plausible cause of these events is considered to be
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A rapid increase of 14C is observed in an ancient buried tree from BC 3372 to BC 3371, and it is suggested that this event could originate from a large solar proton event.
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