Home > 国立天文台談話会 > 2015.3.30-4.5

2015.3.30-4.5

4月2日(木)16:00~17:00  国立天文台談話会   大セミナー室
Apr 2 Thu   NAOJ Seminar          Large Seminar Room

詳細は以下をご覧下さい。

4月2日(木)

キャンパス
三鷹
セミナー名
国立天文台談話会
臨時・定例の別
定例
日時
4月2日 (木) 16:00-17:00
場所
大セミナー室
講演者
Allan Sacha Brun
所属
CEA-Saclay, France
タイトル
“What’s new inside the Sun?”
Abstract
We will discuss our recent progress to model in 3-D the solar global interior dynamics using the anelastic spherical harmonic (ASH) code. We will show that the nonlinear mechanical and thermal coupling between a turbulent convective envelope and a stable radiative interior yields realistic rotation profile, with a differentially rotating convective envelope and a tachocline of shear at its base. We will further investigate the excitation and propagation of internal waves in the deep radiative interior. Thanks to the use of a realistic seismically calibrated stratification (i.e solar-like Brunt-V\”ais\”al\”a frequency), we observe a large spectrum of internal waves in our simulation. These modes are excited by the continuous pummeling of convective plumes. When comparing with asymptotic formulations and an adiabatic oscillation code we find a good overall agreement and confirm that those waves are indeed gravity waves. We then discuss their properties and visibility at the surface and compare with recent observations.
連絡先
名前:久保 雅仁

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