Volume 438, Number 1, July IV 2005
|Page(s)||365 - 376|
|Published online||06 July 2005|
Spectrum and amplitudes of internal gravity waves excited by penetrative convection in solar-type stars
Observatoire Midi-Pyrénées, UMR 5572, Université Paul Sabatier et CNRS, 31400 Toulouse, France e-mail: email@example.com
2 NORDITA, Blegdamsvej 17, 2100 Copenhagen Ø, Denmark
3 Niels Bohr Institute, Juliane Maries Vej 30, 2100 Copenhagen Ø, Denmark
4 Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824, USA
Accepted: 5 April 2005
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.
Key words: hydrodynamics / convection / waves / stars: oscillations / methods: numerical
© ESO, 2005
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.