Spectrum and amplitudes of internal gravity waves excited by penetrative convection in solar-type stars

被引：54
作者：
Dintrans, B [1 ]
Brandenburg, A
Nordlund, Å
Stein, RF
机构：
[1] Univ Toulouse 3, Observ Midi Pyrenees, UMR 5572, F-31400 Toulouse, France
[2] CNRS, F-31400 Toulouse, France
[3] NORDITA, DK-2100 Copenhagen, Denmark
[4] Niels Bohr Inst, DK-2100 Copenhagen, Denmark
[5] Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA
来源：
ASTRONOMY & ASTROPHYSICS | 2005年 / 438卷 / 01期
关键词：
hydrodynamics; convection; waves; stars : oscillations; methods : numerical;
D O I：
10.1051/0004-6361:20052831
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The excitation of internal gravity waves by penetrative convective plumes is investigated using 2-D direct simulations of compressible convection. The wave generation is quantitatively studied from the linear response of the radiative zone to the plumes penetration, using projections onto the g-modes solutions of the associated linear eigenvalue problem for the perturbations. This allows an accurate determination of both the spectrum and amplitudes of the stochastically excited modes. Using time-frequency diagrams of the mode amplitudes, we then show that the lifetime of a mode is around twice its period and that during times of significant excitation up to 40% of the total kinetic energy may be contained into g- modes.
引用
收藏
页码：365 / 376
页数：12
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