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年輪中^<14>C 濃度測定による紀元前4 世紀太陽活動極小期における太陽活動周期の研究
https://doi.org/10.18999/sumrua.20.145
https://doi.org/10.18999/sumrua.20.145872a80be-7ba2-446a-9c71-8f27ff75480f
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
nagaya2008.pdf (10.4 MB)
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| Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2011-05-02 | |||||
| タイトル | ||||||
| タイトル | 年輪中^<14>C 濃度測定による紀元前4 世紀太陽活動極小期における太陽活動周期の研究 | |||||
| 言語 | ja | |||||
| その他のタイトル | ||||||
| その他のタイトル | Variation of the solar cycle length during the grand solar minimum in the 4^th century B.C. deduced from ^<14>C contents in Japanese camphor tree rings | |||||
| 言語 | en | |||||
| 著者 |
永冶, 健太朗
× 永冶, 健太朗× 増田, 公明× 中村, 俊夫× 宮原, ひろ子× 松崎, 浩之× 村木, 綏× Nagaya, Kentaro× Masuda, Kimiaki× Nakamura, Toshio× Miyahara, Hiroko× Mtsuzaki, Hiroyuki× Muraki, Yasushi |
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| アクセス権 | ||||||
| アクセス権 | open access | |||||
| アクセス権URI | http://purl.org/coar/access_right/c_abf2 | |||||
| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Variation of the sunspot number, which reflects solar activity, has shown the periodicity of around 11-year since the early 18th century. However, in the period of 1645 to 1715 AD sunspots were almost absent, and this period is called the Maunder Minimum, one of grand solar minima implying weak solar activity. Variation of solar activity in grand solar minima can be investigated by determining the concentration of cosmogenic isotope ^<14>C in annual tree rings. We previously obtained the ^<14>C records of1413 to 1745 AD including the Spoerer Minimum (1416-1534 AD) and the Maunder Minimum with annual time resolution. As a result of frequency analysis of these ^<14>C records, we found that the cycle length of the "11-year cycle" during the Maunder Minimum was around 14 years while that during the Spoerer Minimum was modulating slightly from 11 years. This result suggests that a pattern of the "11-year" cycle length variation depends on a type of minima classified by their duration of estimated sunspot absence. In order to verify this hypothesis, we have measured ^<14>C contents in Japanese camphor tree rings during a possible grand solar minimum in the 4th century B.C. Preliminary result shows the solar cycle length was several years longer than 11 years, as in the Maunder Minimum. | |||||
| 言語 | en | |||||
| 出版者 | ||||||
| 出版者 | 名古屋大学年代測定資料研究センター | |||||
| 言語 | ja | |||||
| 言語 | ||||||
| 言語 | jpn | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
| 資源タイプ | departmental bulletin paper | |||||
| 出版タイプ | ||||||
| 出版タイプ | VoR | |||||
| 出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||
| ID登録 | ||||||
| ID登録 | 10.18999/sumrua.20.145 | |||||
| ID登録タイプ | JaLC | |||||
| 書誌情報 |
ja : 名古屋大学加速器質量分析計業績報告書 巻 20, p. 145-151, 発行日 2009-03 |
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| 著者版フラグ | ||||||
| 値 | publisher | |||||
