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

Abstract : 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.
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https://hal.archives-ouvertes.fr/hal-00009165
Contributor : Boris Dintrans <>
Submitted on : Wednesday, September 28, 2005 - 2:38:55 PM
Last modification on : Wednesday, September 28, 2005 - 2:38:55 PM

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Boris Dintrans, Axel Brandenburg, Aake Nordlund, Robert F. Stein. Spectrum and amplitudes of internal gravity waves excited by penetrative convection in solar-type stars. Astronomy and Astrophysics - A&A, EDP Sciences, 2005, 438, pp.365. ⟨10.1051/0004-6361:20052831⟩. ⟨hal-00009165⟩

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