Deep convection and dynamo action of giant planet.

2016 Fiscal Year Final Research Report

• Project/Area Number: 25800273
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Space and upper atmospheric physics
• Research Institution: Kyoto University
• 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)
• Project Period (FY): 2013-04-01 – 2017-03-31
• Keywords: 木星型惑星 / ダイナモ作用 / 数値モデル

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.

Free Research Field

地球惑星科学