| Project/Area Number |
24244073
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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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 |
YANAGISAWA Takatoshi 国立研究開発法人海洋研究開発機構, 地球深部ダイナミクス研究分野, 主任研究員 (20359186)
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| Co-Investigator(Kenkyū-buntansha) |
TASAKA Yuji 北海道大学, 工学研究院, 准教授 (00419946)
KAGEYAMA Akira 神戸大学, システム情報学研究科, 教授 (20260052)
SAKURABA Ataru 東京大学, 理学系研究科, 助教 (50345261)
MIYAGOSHI Takehiro 国立研究開発法人海洋研究開発機構, 地球深部ダイナミクス研究分野, 主任研究員 (60435807)
SUMITA Ikuro 金沢大学, 自然システム学系, 准教授 (90334747)
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| Co-Investigator(Renkei-kenkyūsha) |
HAMANO Yozo 国立研究開発法人海洋研究開発機構, 地球深部ダイナミクス研究分野, 特任上席研究員 (90011709)
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| Project Period (FY) |
2012-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥44,850,000 (Direct Cost: ¥34,500,000、Indirect Cost: ¥10,350,000)
Fiscal Year 2015: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2014: ¥10,920,000 (Direct Cost: ¥8,400,000、Indirect Cost: ¥2,520,000)
Fiscal Year 2013: ¥13,390,000 (Direct Cost: ¥10,300,000、Indirect Cost: ¥3,090,000)
Fiscal Year 2012: ¥15,990,000 (Direct Cost: ¥12,300,000、Indirect Cost: ¥3,690,000)
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| Keywords | 地磁気の逆転 / 液体金属の対流 / 流れ場の反転 / 室内実験 / 数値シミュレーション / 地磁気 / 逆転 / 液体金属 |
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| Outline of Final Research Achievements |
We explored magnetoconvection and rotating convection by means of laboratory experiments and numerical simulations, to elucidate the mechanism that induces geomagnetic polarity reversals. We established a regime diagram of convection in a liquid metal under the influence of imposed horizontal magnetic field. The searched space is summarized by the relation between buoyancy and magnetic force, in which a regime exists that reversals of flow direction repeat intermittently. We found that the key mechanism for flow reversals is an occurrence of large-scale circulation in a horizontal plane. We also performed numerical simulations of dynamos in a rotating spherical shell, and clarified the relation between polarity reversals and transitions of convection flow.
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