Long-term variations of solar activity and cosmic rays based on the carbon-14 content in tree rings
Long-term variations of solar activity and cosmic rays based on the carbon-14 content in tree rings
批准号:
21740162
负责人:
MIYAHARA Hiroko
金额:
$3.74万
依托单位:
依托单位国家:
日本
项目类别:
Grant-in-Aid for Young Scientists (B)
财政年份:
2009
资助国家:
日本
项目状态:
已结题
起止时间:
2009 至 2010
中文摘要
我们以年时间分辨率测量了树木年轮中的碳14含量,并探测到过去11年太阳周期的延长/缩短。11年太阳活动周期的长度反映了太阳磁场活动的水平。所得结果表明,太阳活动水平在千禧年尺度上没有明显的变化趋势。
英文摘要
We have measured the carbon-14 content in tree rings with annual time resolution and have detected the lengthening/shortening of the eleven-year solar cycles in the past. Lengths of the eleven-year solar cycles reflect the level of solar magnetic activity. The obtained results have suggested that there is no significant millennial-scale trend in solar activity level.
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作者:
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通讯作者:
Determination of absolute ages of annual scale GCR enhancements during the Maunder Minimum based on high precision measurements of radiocarbon content in tree rings
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批准号:23654080
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项目类别:Grant-in-Aid for Challenging Exploratory Research
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资助金额:$2.41万
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财政年份:2011
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负责人:MIYAHARA Hiroko
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依托单位:
海外基金