Magneto-hydrodynamic interaction between planetary inner and outer cores
| Project/Area Number |
25610139
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Meteorology/Physical oceanography/Hydrology
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| Research Institution | Kyoto University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
YAMADA MICHIO 京都大学, 数理解析研究所, 教授 (90166736)
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2015: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2013: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
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| Keywords | 内核外核境界 / 相変化 / ジュール熱 / ダイナモ過程 / 核マントル境界 / 安定成層 / アルフベン波 / 貫入距離 / ダイナモ作用 / 内核外核相互作用 / 地球磁場 / 地球内核外核境界 / 表面変位 |
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| Outline of Final Research Achievements |
In order to elucidate fundamental characteristics of fluid motion in
planetary cores, magneto-hydrodynamic interaction between planetary inner and outer cores is investigated theoretically and numerically. First, inner core flows induced by Joule heating of the magnetic field penetrating from the outer core are obtained analytically and numerically. Second, penetration of fluid motions into the upper stably stratified layer near the top of the outer core is examined and the analytical expressions of penetration distance are derived. These expressions are validated by numerical calculations of magneto-hydrodynamic thermal convection in a rotating spherical shell. Finally, numerical experiments of the whole planetary central cores with a coupled inner-outer cores magneto-hydrodynamic fluid model are performed. It is shown that the inner core flows with upward and downward in the equatorial and polar regions respectively emerge.
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Report
(4 results)
Research Products
(26 results)
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[Journal Article] A spherical shell numerical dynamo benchmark with pseudo-vacuum magnetic boundary conditions2014
Author(s)
Jackson, A., Sheyko,A., Marti, P., Tilgner, A., Cebron, D., Vantieghem, S., Simitev, R., Busse, F., Zhan, X., Schubert, G., Takehiro, S., Sasaki, Y., Hayashi, Y.-Y., Ribeiro, A., Nore, C., Guermond, J.-L.
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Journal Title
Geophysical Journal International
Volume: 196
Issue: 2
Pages: 712-723
DOI
Related Report
Peer Reviewed
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[Journal Article] Full sphere hydrodynamic and dynamo benchmarks2014
Author(s)
Marti, P., Schaeffer, N., Hollerbach, R., Cebron, D., Nore, C., Luddens, F., Guermond, J.-L., Aubert, J., Takehiro, S., Sasaki, Y., Hayashi, Y.-Y., Simitev, R., Busse, F., Vantieghem, S., Jackson, A.
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Journal Title
Geophysical Journal International
Volume: 197
Issue: 1
Pages: 119-134
DOI
Related Report
Peer Reviewed
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