2009 Fiscal Year Final Research Report
Mathematics of inviscid MHD dynamos and fundamental structure of core convection
| Project/Area Number |
20740250
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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 | The University of Tokyo |
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Principal Investigator |
SAKURABA Ataru The University of Tokyo, 大学院・理学系研究科, 助教 (50345261)
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| Project Period (FY) |
2008 – 2009
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| Keywords | 地球電磁気 / 地磁気 / 非線形偏微分方程式 / 電磁流体 / 回転流体 / 地球ダイナモ |
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| Research Abstract |
Numerical simulations of low-viscosity Earth-type dynamo show that, contrary to previous similar studies, an Earth-like strong magnetic field and a large-scale convection pattern can emerge. This contradiction arises because previous models imposed a geophysically inappropriate uniform-surface-temperature boundary condition. Although the core viscosity is much lower than the numerical models, it is suggested that a strong magnetic field and large-scale convection are still alive even in an inviscid limit.
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