{"_buckets": {"deposit": "631c6b67-11d0-4807-9780-d0f28af0f395"}, "_deposit": {"id": "11780", "owners": [], "pid": {"revision_id": 0, "type": "depid", "value": "11780"}, "status": "published"}, "_oai": {"id": "oai:nagoya.repo.nii.ac.jp:00011780"}, "item_9_alternative_title_19": {"attribute_name": "\u305d\u306e\u4ed6\u306e\u8a00\u8a9e\u306e\u30bf\u30a4\u30c8\u30eb", "attribute_value_mlt": [{"subitem_alternative_title": "Analysis of the periodicity of the solar activity deduced from ^\u003c14\u003eC content(Proceedings of the 18^\u003cth\u003e Symposium on Chronological Studies at the Nagoya University Center for Chronological Research in 2005)"}]}, "item_9_biblio_info_6": {"attribute_name": "\u66f8\u8a8c\u60c5\u5831", "attribute_value_mlt": [{"bibliographicIssueDates": {"bibliographicIssueDate": "2006-03", "bibliographicIssueDateType": "Issued"}, "bibliographicPageEnd": "59", "bibliographicPageStart": "50", "bibliographicVolumeNumber": "17", "bibliographic_titles": [{"bibliographic_title": "\u540d\u53e4\u5c4b\u5927\u5b66\u52a0\u901f\u5668\u8cea\u91cf\u5206\u6790\u8a08\u696d\u7e3e\u5831\u544a\u66f8"}]}]}, "item_9_description_4": {"attribute_name": "\u6284\u9332", "attribute_value_mlt": [{"subitem_description": "Radiocarbon ^\u003c14\u003eC, which is one of cosmogenic radioisotopes, is a good index of solar activity. Investigation of the ^\u003c14\u003eC content in each tree ring gives information on the change of solar activity in the past. Variation of the ^\u003c14\u003eC content shows that grand solar minima, when the solar activity was extremely weak for several ten years or more, occurred many times in the past. The Maunder Minimum (1645-1720 AD), one of the grand solar minima in the last millennium, is well known to have had almost no sunspots, and then periodicity of solar activity cannot be seen. Therefore, we have investigated the periodicity of radiocarbon content in tree rings in order to clarify the characteristics of variation of solar activity during the grand solar minima. We have already obtained the ^\u003c14\u003eC records for 1413-1554 AD including the Spoerer Minimum and for 1617-1745 AD including the Maunder Minimum with annual time resolution by using Japanese cedar trees. As a result of frequency analysis of these radiocarbon records, we found that the Sun maintained periodic variation even if the minima. We found, however, the length of the \"eleven-year\" cycle during the Maunder Minimum was around 14 years and that during the Spoerer Minimum was around 11 years. This suggests that the cycle length is related to solar activity, and that the pattern of periodicity of solar activity for the type of grand solar minimum. In order to clarify these possibilities, we have investigated periodicity of solar activity in periods other than the grand solar minimum by measuring the ^\u003c14\u003eC content in the period between the Maunder Minimum and the Spoerer Minimum (1555-1615 AD) and 9^\u003cth\u003e-10^\u003cth\u003e centuries (880-964AD). As a result, we found that the length of the \"eleven-year\" cycle during the normal period was around 11 years, which was expected from the modern solar activity. This result supports the difference in the cycle length in each solar minimum mentioned above. Furthermore, inverse correlation of the strength of solar activity and the cycle length is suggested. Our results should be a great clue as to the mechanism to which solar activity becomes weak and bases for studies of long-term solar periodic variations.", "subitem_description_type": "Abstract"}]}, "item_9_description_5": {"attribute_name": "\u5185\u5bb9\u8a18\u8ff0", "attribute_value_mlt": [{"subitem_description": "\u7b2c18\u56de\u540d\u53e4\u5c4b\u5927\u5b66\u5e74\u4ee3\u6e2c\u5b9a\u7dcf\u5408\u7814\u7a76\u30bb\u30f3\u30bf\u30fc\u30b7\u30f3\u30dd\u30b8\u30a6\u30e0\u5e73\u621017(2005)\u5e74\u5ea6\u5831\u544a Proceedings of the 18th symposiumon on Chronological Studies at the Nagoya University Center for Chronological Research\\\nin 2005 \u65e5\u6642:\u5e73\u621018 (2006)\u5e741\u670817\u65e5(\u706b)\uff6418\u65e5(\u6c34) \u4f1a\u5834:\u540d\u53e4\u5c4b\u5927\u5b66\u30b7\u30f3\u30dd\u30b8\u30aa\u30f3 Date:Januaryl7th and 18th, 2006 Venue:Nagoya Uhiversity Symposion Hall", "subitem_description_type": "Other"}]}, "item_9_identifier_registration": {"attribute_name": "ID\u767b\u9332", 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