Spectrum and amplitudes of internal gravity waves excited by penetrative convection in solar-type stars
Feb, 2005
12 pages
Published in:
- Astron.Astrophys. 438 (2005) 365-376
e-Print:
- astro-ph/0502138 [astro-ph]
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Abstract: (arXiv)
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.- HYDRODYNAMICS
- CONVECTION
- STARS OSCILLATIONS
- NUMERICAL METHODS
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