Deep convection and dynamo action of giant planet.
| Project/Area Number |
25800273
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Space and upper atmospheric physics
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| Research Institution | Kyoto University |
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Principal Investigator |
SASAKI Youhei 京都大学, スーパーグローバルコース数学系ユニット, 特定助教 (70583459)
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| Project Period (FY) |
2013-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2016: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2015: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2014: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2013: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
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| Keywords | 木星型惑星 / ダイナモ作用 / 数値モデル / 深部対流 / 回転球殻対流 / 圧縮性流体 / MHDダイナモ / 巨大惑星 / 縞状構造 / 非弾性方程式系 |
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| Outline of Final Research Achievements |
Numerical model for MHD in rotating sphericall shells is developed. Linear stability analysis of compressible % thermal convection in rotating spherical shells using this numerical model is performed with the anelastic approximation. At large compressibility, the location of convection column is close to the outer boundary, and the convective motion occurs are near the outer boundary. This feature is highly depends radical thermal diffusivity. Numerical experiments of magneto-hydrodynamic dynamo in a rotating spherical shell with a strongly stable outer layer are performed. The proposed theoretical expression of propagation distance of the Alfven waves suggests that the numerically obtained fields permit the complete propagation of the Alfven waves across the stable layer.
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Report
(5 results)
Research Products
(29 results)
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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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[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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[Presentation] Mean zonal flows induced by Boussinesq thermal convection in rotating spherical shells as an application to the gas giant planets2017
Author(s)
Takehiro, S., Sasaki, Y., Ishioka, K., Nakajima, K., Hayashi, Y.-Y.
Organizer
WTK Aquaplanet Workshop, 21st January 2017
Place of Presentation
National Astronomical Observatory of Japan
Year and Date
2017-01-21
Related Report
Invited
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[Presentation] GFD-Dennou Club DCMODEL project2017
Author(s)
Takehiro S., Takahashi, Y. O., Sugiyama, K., Odaka, M., Ishiwatari, M., Horinouchi, T., Sasaki, Y., Ishioka, K., Nakajima, K., Hayashi, Y.-Y.
Organizer
WTK Aquaplanet Workshop
Place of Presentation
CPS, Kobe University
Year and Date
2017-01-21
Related Report
Invited
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[Presentation] Diversity of atmospheric circulations of sycronized rotating Jovian type planets2013
Author(s)
Takehiro, S., Sasaki, Y., Takahashi, Y. O., Nakajima, K., Hayashi, Y.-Y., Kuramoto, K.
Organizer
5th Subaru International Conference: Exoplanets and Disks:Their Formation and Diversity II
Place of Presentation
Sheraton Kona Resort & Spa Keauhou Bay, The Big island of Hawaii.
Related Report
Invited
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[Presentation] Weak-field dynamo emerging in a rotating spherical shell with stress-free top and no-slip bottom boundaries2013
Author(s)
Sasaki, Y., Takehiro, S., Kuramoto, K., Hayashi, Y.-Y.
Organizer
Mathematical analysis of magneto-hydrodynamical processes in stars
Place of Presentation
Kansai Seminar House, Sakyo-ku, Kyoto, Japan.
Related Report
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