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

Author

Listed:
  • 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)

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.

Suggested Citation

  • Fusa Miyake & Kentaro Nagaya & Kimiaki Masuda & Toshio Nakamura, 2012. "A signature of cosmic-ray increase in ad 774–775 from tree rings in Japan," Nature, Nature, vol. 486(7402), pages 240-242, June.
    • Handle: RePEc:nat:nature:v:486:y:2012:i:7402:d:10.1038_nature11123
    DOI: 10.1038/nature11123
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    Cited by:

    1. Nicolas Brehm & Marcus Christl & Timothy D. J. Knowles & Emmanuelle Casanova & Richard P. Evershed & Florian Adolphi & Raimund Muscheler & Hans-Arno Synal & Florian Mekhaldi & Chiara I. Paleari & Hann, 2022. "Tree-rings reveal two strong solar proton events in 7176 and 5259 BCE," Nature Communications, Nature, vol. 13(1), pages 1-8, December.

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