2024-03-28T11:20:30Z
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.
Horiuchi, K.
Motizuki, Y.
Nakai, Y.
Takahashi, K.
Masuda, K.
Motoyama, H.
Matsuzaki, H.
open access
© 2019 American Geophysical Union
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
Wiley
2019-01-16
eng
journal article
VoR
http://hdl.handle.net/2237/00030139
https://nagoya.repo.nii.ac.jp/records/27940
https://doi.org/10.1029/2018GL080475
0094-8276
1944-8007
Geophysical Research Letters
46
1
11
18
https://nagoya.repo.nii.ac.jp/record/27940/files/Miyake_et_al-2019-Geophysical_Research_Letters.pdf
application/pdf
929.9 kB
2019-07-16