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

Overview of attention for article published in Nature, June 2012
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About this Attention Score

  • In the top 5% of all research outputs scored by Altmetric
  • High Attention Score compared to outputs of the same age (99th percentile)
  • High Attention Score compared to outputs of the same age and source (97th percentile)

Mentioned by

news
25 news outlets
blogs
14 blogs
twitter
115 tweeters
wikipedia
11 Wikipedia pages
googleplus
9 Google+ users
reddit
1 Redditor

Citations

dimensions_citation
268 Dimensions

Readers on

mendeley
221 Mendeley
citeulike
3 CiteULike
Title
A signature of cosmic-ray increase in ad 774–775 from tree rings in Japan
Published in
Nature, June 2012
DOI 10.1038/nature11123
Pubmed ID
Authors

Fusa Miyake, Kentaro Nagaya, Kimiaki Masuda, Toshio Nakamura

Abstract

Increases in (14)C concentrations in tree rings could be attributed to cosmic-ray events, as have increases in (10)Be 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 (14)C content of trees over a period of approximately 10,000 years, shows three periods during which (14)C increased at a rate greater than 3‰ over 10 years. Two of these periods have been measured at high time resolution, but neither showed increases on a timescale of about 1 year (refs 11 and 12). Here we report (14)C measurements in annual rings of Japanese cedar trees from ad 750 to ad 820 (the remaining period), with 1- and 2-year resolution. We find a rapid increase of about 12‰ in the (14)C content from ad 774 to 775, which is about 20 times larger than the change attributed to ordinary solar modulation. When averaged over 10 years, the data are consistent with the decadal IntCal (14)C data from North American and European trees. We argue that neither a solar flare nor a local supernova is likely to have been responsible.

Twitter Demographics

The data shown below were collected from the profiles of 115 tweeters who shared this research output. Click here to find out more about how the information was compiled.

Mendeley readers

The data shown below were compiled from readership statistics for 221 Mendeley readers of this research output. Click here to see the associated Mendeley record.

Geographical breakdown

Country Count As %
Japan 7 3%
United States 5 2%
Germany 3 1%
Brazil 2 <1%
Switzerland 2 <1%
China 2 <1%
Peru 1 <1%
Sweden 1 <1%
Netherlands 1 <1%
Other 3 1%
Unknown 194 88%

Demographic breakdown

Readers by professional status Count As %
Researcher 59 27%
Student > Ph. D. Student 34 15%
Student > Master 22 10%
Professor > Associate Professor 20 9%
Student > Bachelor 20 9%
Other 37 17%
Unknown 29 13%
Readers by discipline Count As %
Earth and Planetary Sciences 62 28%
Physics and Astronomy 44 20%
Environmental Science 19 9%
Agricultural and Biological Sciences 18 8%
Social Sciences 10 5%
Other 27 12%
Unknown 41 19%

Attention Score in Context

This research output has an Altmetric Attention Score of 375. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 20 November 2021.
All research outputs
#53,736
of 19,982,192 outputs
Outputs from Nature
#4,856
of 84,953 outputs
Outputs of similar age
#211
of 140,121 outputs
Outputs of similar age from Nature
#24
of 826 outputs
Altmetric has tracked 19,982,192 research outputs across all sources so far. Compared to these this one has done particularly well and is in the 99th percentile: it's in the top 5% of all research outputs ever tracked by Altmetric.
So far Altmetric has tracked 84,953 research outputs from this source. They typically receive a lot more attention than average, with a mean Attention Score of 95.0. This one has done particularly well, scoring higher than 94% of its peers.
Older research outputs will score higher simply because they've had more time to accumulate mentions. To account for age we can compare this Altmetric Attention Score to the 140,121 tracked outputs that were published within six weeks on either side of this one in any source. This one has done particularly well, scoring higher than 99% of its contemporaries.
We're also able to compare this research output to 826 others from the same source and published within six weeks on either side of this one. This one has done particularly well, scoring higher than 97% of its contemporaries.