2024-03-28T14:26:56Z
https://nagoya.repo.nii.ac.jp/oai
oai:nagoya.repo.nii.ac.jp:00014608
2023-01-16T04:58:48Z
879:1183:1184:1395
Reconstruction of the solar activity in 7-11 centuries by the carbon 14 content in tree-rings
樹木年輪中放射性炭素14濃度測定による7-11世紀の太陽活動の復元
三宅, 芙沙
83264
永冶, 健太朗
83265
増田, 公明
83266
中村, 俊夫
83267
Miyake, Fusa
83268
Nagaya, Kentaro
83269
Masuda, Kimiaki
83270
Nakamura, Toshio
83271
Solar cycle
Cosmogenic nuclide
2011-03
Radiocarbon 14C is produced by the galactic cosmic rays which are modulated by solar magnetic activity because most cosmic rays are charged particles. 14C is oxidized to form 14CO2 and taken by trees during the carbon cycle. So 14C content in tree-rings is retained for record of the past cosmic ray intensity and the solar activity. We have measured the 14C content in Japanese cedar tree rings from 602 to 1072 AD with 2-year resolution, and found a rapid increase in 14C content at 775 AD. This 775 AD peak is consistent with the decadal IntCal data and the 10Be record from the Antarctic ice core. Therefore, it is highly possible that this peak was recorded all over the world and it was due to the increase in the cosmic ray intensity in 775 AD. The 11-year and 14-year periodicities are detected by the Fourier analysis on the 14C content data from 602 to 1072 AD. These periodicities may come from the solar cycle (Schwabe cycle).
第23回名古屋大学年代測定総合研究センターシンポジウム平成22(2010)年度報告
departmental bulletin paper
名古屋大学年代測定資料研究センター
2011-03
名古屋大学加速器質量分析計業績報告書
22
135
139
jpn