Long-term variations of solar activity and cosmic rays based on the carbon-14 content in tree rings
| Project/Area Number |
21740162
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Particle/Nuclear/Cosmic ray/Astro physics
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| Research Institution | The University of Tokyo |
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Principal Investigator |
MIYAHARA Hiroko The University of Tokyo, 宇宙線研究所, 特任助教 (00532681)
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| Project Period (FY) |
2009 – 2010
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| Project Status |
Completed (Fiscal Year 2010)
|
| Budget Amount *help |
¥5,850,000 (Direct Cost: ¥4,500,000、Indirect Cost: ¥1,350,000)
Fiscal Year 2010: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2009: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
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| Keywords | 太陽活動 / 宇宙線 / 気候変動 / 宇宙線生成核種 / 炭素14 / 樹木年輪 / 宇宙線起源核種 / 年輪 |
|---|
| Research Abstract |
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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Report
(3 results)
Research Products
(25 results)
