Cited by 67Geology and Paleoclimatology ResearchTree-ring climate responsesArchaeology and ancient environmental studies

Large 14 C excursion in 5480 BC indicates an abnormal sun in the mid-Holocene

Open access
Miyake, Fusa, Jull, A. J. Timothy, Panyushkina, Irina P., Wacker, Lukas, Salzer, Matthew, Baisan, Christopher H., Lange, Todd, Cruz, Richard +2 more·2017·Proceedings of the National Academy of Sciences

Abstract

Significance: Carbon-14 contents in tree rings tell us information of the past cosmic ray intensities because cosmic rays produce 14 C in the atmosphere. We found a signature of a quite large increase of incoming cosmic ray intensity in the mid-Holocene (the 5480 BC event) from the measurement of 14 C content in North American tree rings. The cause of this event is supposed to be an extremely weak sun, or a combination of successive strong solar bursts and variation of a solar magnetic activity. In any case, 14 C variation of the 5480 BC event is extraordinary in the Holocene, and this event indicates the abnormal solar activity compared with other periods.

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.1073/pnas.1613144114

Cites

39 of 39 references verified0 citation errors · 0 not checkable

Statistics

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • Many AMS 14C measurement series do not exhibit an unexpected older offset versus comparable samples measured by LLGPC.

    “many AMS 14C measurement series do not exhibit such an unexpected older offset versus comparable samples measured by LLGPC (4, 40–42)”

    From Mediterranean radiocarbon offsets and calendar dates for prehistory (2020) · cites this paper as [42]

    The Method and Result section (page unavailable) reports that three AMS measurement series agree with one another and that their combined data are almost consistent with IntCal13 and its original data. It does not identify those comparison samples as measured by LLGPC or establish the broader claim about many AMS series lacking an older offset relative to LLGPC. (LLM, conf=0.78)

    Experimental — accuracy not yet measured
  • We would have anticipated that the AA data on BCP and IrO should be similar to the IntCal datasets and the Hd GeO data, given the good agreement in other recent work between GeO and BCP and between GeO and IrO.

    “We would therefore have anticipated that the AA data on BCP and IrO (13) should be similar to the IntCal datasets (1–4) and the Hd GeO data (38), given the good agreement in other recent work between GeO and BCP (40–42) and between GeO and IrO (1–4).”

    From Mediterranean radiocarbon offsets and calendar dates for prehistory (2020) · cites this paper as [42]

    The Method and Result section (page unavailable) says the study’s bristlecone-pine measurements were almost consistent with IntCal13 and its original data. But it does not establish agreement specifically between German oak (GeO) and bristlecone pine (BCP); the Figure 1 caption (page unavailable) cautions that the original IntCal datasets were not consistent with each other. (LLM, conf=0.82)

    Experimental — accuracy not yet measured

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Cites

Flagged first, then by citations

Research works printed but not linked: 1

  1. Miyake F. (2013) Reconstruction of cosmic-ray intensity in the past from measurements of radiocarbon in tree rings. Doctoral thesis, Nagoya University.

Cited by

Sorted by citations

Authors
Miyake, F., Jull, A. J. T., Panyushkina, I. P., Wacker, L., Salzer, M., Baisan, C. H., Lange, T., Cruz, R., Masuda, K., & Nakamura, T.
Affiliations
  • Institute for Space-Earth Environmental Research, Nagoya University (JP)
  • University of Arizona (US)
  • Laboratory of Tree Ring Research, University of Arizona, Tucson, AZ 85721;
  • ETH Zurich (CH)
Venue
Proceedings of the National Academy of Sciences
Published
2017-01-18
Volume
114
Issue
5
Pages
881-884
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2577659028
Cited by
67
References
39
Citations by year
2026: 6 · 2025: 6 · 2024: 4 · 2023: 6 · 2022: 6 · 2021: 8 · 2020: 11 · 2019: 11 · 2018: 9
FWCI
4.91
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • UA Campus Repository (The University of Arizona) (acceptedVersion)
Funders
Japan Society for the Promotion of Science (26887019, G2602)
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 › Earth and Planetary Sciences › Paleontology › Archaeology and ancient environmental studies
Keywords
cosmic ray intensity, solar activity, solar magnetic activity, solar bursts, tree rings, Holocene, paleoclimate

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review