2011 Fiscal Year Final Research Report
Development of geodynamo model with length-of-day variation and non-uniform of diffusion rate at boundary
| Project/Area Number |
22740301
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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 |
Solid earth and planetary physics
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| Research Institution | Japan Agency for Marine-Earth Science and Technology |
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Principal Investigator |
MIYAGOSHI Takehiro 独立行政法人海洋研究開発機構, 地球内部ダイナミクス領域, 研究員 (60435807)
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| Project Period (FY) |
2010 – 2011
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| Keywords | 地磁気変動 / 地球回転変動 / 地球ダイナモ |
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| Research Abstract |
Correlation of geomagnetic field variation with length-of-day variation has been pointed out. However, there are no geodynamo models which take an effect of length-of-day variation into consideration. We have done geodynamo simulations which can deal with length-of-day variation. We found magnetic field variation arises and its amplitude is larger than that of length-of-day variation. There is a phase gap between length-of-day variation and geomagnetic field variation. We also found magnetic field variation is affected by the period of length-of-day variation.
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