2024-03-28T16:05:03Z
https://nagoya.repo.nii.ac.jp/oai
oai:nagoya.repo.nii.ac.jp:00027940
2023-01-16T04:45:27Z
879:880:881
10Be Signature of the Cosmic Ray Event in the 10th Century CE in Both Hemispheres, as Confirmed by Quasi-Annual 10Be Data From the Antarctic Dome Fuji Ice Core
Miyake, F.
90961
Horiuchi, K.
90962
Motizuki, Y.
90963
Nakai, Y.
90964
Takahashi, K.
90965
Masuda, K.
90966
Motoyama, H.
90967
Matsuzaki, H.
90968
cosmogenic nuclides
beryllium‐10
annual cosmic ray event
Dome Fuji
ice core
Cosmogenic nuclides are good indicators of past cosmic ray events and variations. To verify such phenomena, it is important to evaluate them using multiple nuclides from different archives. The cosmic ray event in 993–994 Common Era (CE) has already been confirmed with 14C and 10Be data, which show rapid increases in the concentrations. However, the 10Be data were obtained from the Greenland ice cores in the Northern Hemisphere. To investigate the extent of the 10Be increase in the Southern Hemisphere, we measured quasi‐annual 10Be concentrations between 980 and 1,011 CE in the Antarctic Dome Fuji ice core. We observed a ~50% increase in 10Be concentration around 994 CE, consistent with the Greenland data. Increases in 10Be concentrations in both hemispheres support a solar origin of the 994‐CE event. In addition, we propose a method of evaluating the so‐called “system effect” for 10Be deposition by extracting common components from 10Be and Na+ data.
ファイル公開:2019-07-16
journal article
Wiley
2019-01-16
application/pdf
Geophysical Research Letters
1
46
11
18
0094-8276
1944-8007
https://nagoya.repo.nii.ac.jp/record/27940/files/Miyake_et_al-2019-Geophysical_Research_Letters.pdf
eng
https://doi.org/10.1029/2018GL080475
© 2019 American Geophysical Union