Cosmic ray event of A.D. 774-775 shown in quasi-annual10Be data from the Antarctic Dome Fuji ice core
Open accessAbstract
14C content in tree rings and 10Be concentration records in polar ice core provide information about past cosmic ray intensities. The A.D. 774–775 cosmic ray event has been identified by 14C measurement in several tree rings from all over the world. Although the quasi-decadal 10Be Dome Fuji data in the Antarctic ice core also shows a sharp peak around A.D. 775, annual 10Be variations in the Dome Fuji core or in other cores have not been revealed. We have measured quasi-annual 10Be concentrations from approximately A.D. 763–794 in the Dome Fuji ice core, and detected a clear increase (~80% above the baseline) in 10Be concentration around A.D. 775. However, an accurate height of this increase is not straightforwardly estimated due to the background variation in 10Be concentration. The 10Be increase can be due to the same cosmic ray event as shown in the 14C content in A.D. 774–775.
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The AD 774-775 event is now considered to have been caused by an extreme solar proton event.
“The AD 774 -775 (1175 -1176 cal BP) (Miyake et al. 2012) event is the most rapid and largest yet observed and is widely replicated (e.g. Büntgen et al. 2018) and is now considered to have been caused by an extreme solar proton event (Mekhaldi et al. 2015; Miyake et al. 2015).”
From The IntCal20 Northern Hemisphere Radiocarbon Age Calibration Curve (0–55 cal kBP) (2020) · cites this paper as Miyake et al. 2015
The Conclusions (section 4; page unavailable) say the observed ¹⁰Be peak makes an extreme solar proton event a more plausible origin of the AD 775 event. That supports the proposed cause, but the claim presents it as established rather than the paper’s qualified conclusion. (LLM, conf=0.88)
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References 50 · Cited by 65
Research works printed but not linked: 1
- [16]16. Güttler, D., J. Beer, N. Bleicher, G. Boswijk, A. G. Hogg, J. G. Palmer, L. Wacker, and J. Wunder (2013), The 774/775 AD Event in the Southern Hemisphere, Annual Report of the Laboratory of Ion Beam Physics, pp. 33, ETH-Zürïch, Zürich, Switzerland.
- Authors
- Miyake, F., Suzuki, A., Masuda, K., Horiuchi, K., Motoyama, H., Matsuzaki, H., Motizuki, Y., Takahashi, K., & Nakai, Y.
- Affiliations
- Nagoya University (JP)
- Hirosaki University (JP)
- National Institute of Polar Research (JP)
- The University of Tokyo (JP)
- RIKEN Nishina Center (JP)
- Corresponding author
- Miyake, Fusa
- Venue
- Geophysical Research Letters
- Publisher
- American Geophysical Union (AGU)
- Published
- 2015-01-08
- Volume
- 42
- Issue
- 1
- Pages
- 84-89
- ISSN
- 0094-8276 (ISSN-L)
- OpenAlex
- W1978148719
- Semantic Scholar
- 2d0cef68d41590c9ae68c351a98e4d8a075e73e9
- Cited by
- 65
- References
- 50
- Citations by year
- 2026: 4 · 2025: 2 · 2024: 3 · 2023: 7 · 2022: 10 · 2021: 8 · 2020: 3 · 2019: 4 · 2018: 3 · 2017: 10 · 2016: 8 · 2015: 3
- FWCI
- 4.64
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Geophysical Research Letters (publishedVersion)
- Funders
- Fellowship of the Japan Society for the Promotion of Science (JSPS) (22340144, 22241003, 22244061, 25247082, 22244015)
- Next Generation World-Leading Researchers (NEXT Program) (GR098)
- Topics
- Physical Sciences › Earth and Planetary Sciences › Atmospheric Science › Geology and Paleoclimatology Research
- Physical Sciences › Earth and Planetary Sciences › Atmospheric Science › Tree-ring climate responses
- Physical Sciences › Physics and Astronomy › Nuclear and High Energy Physics › Astrophysics and Cosmic Phenomena
- Keywords
- beryllium-10, Dome Fuji ice core, cosmic ray intensity, Antarctic ice cores
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