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

Fusa Miyake (), Kentaro Nagaya, Kimiaki Masuda and Toshio Nakamura
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Fusa Miyake: Solar-Terrestrial Environment Laboratory, Nagoya University, Chikusa-ku, Nagoya 464-8601, Japan
Kentaro Nagaya: Solar-Terrestrial Environment Laboratory, Nagoya University, Chikusa-ku, Nagoya 464-8601, Japan
Kimiaki Masuda: Solar-Terrestrial Environment Laboratory, Nagoya University, Chikusa-ku, Nagoya 464-8601, Japan
Toshio Nakamura: Center for Chronological Research, Nagoya University, Chikusa-ku, Nagoya 464-8601, Japan

Nature, 2012, vol. 486, issue 7402, 240-242

Abstract: A rapid increase in the 14C content of Japanese cedar tree rings occurred during ad 774 to 775, and is about 20 times larger than the change attributed to ordinary solar modulation; neither a solar flare nor a local supernova is likely to have been responsible.

Date: 2012
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DOI: 10.1038/nature11123

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