Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-04-25
Astron.Astrophys. 404 (2003) 1129-1138
Astronomy and Astrophysics
Astrophysics
11 pages; 4 figures, accepted for publication in A&A
Scientific paper
10.1051/0004-6361:20030504
A 3D simulation of the upper part of the solar convective zone is used to obtain information on the frequency component, chi_k, of the correlation product of the turbulent velocity field. This component plays an important role in the stochastic excitation of acoustic oscillations. A time analysis of the solar simulation shows that a gaussian function does not correctly reproduce the nu-dependency of chi_k inferred from the 3D simuation in the frequency range where the acoustic energy injected into the solar p modes is important (nu ~ 2 - 4 mHz). The nu-dependency of chi_k is fitted with different analytical functions which can then conveniently be used to compute the acoustic energy supply rate P injected into the solar radial oscillations. With constraints from a 3D simulation, adjustment of free parameters to solar data is no longer necessary and is not performed here. The result is compared with solar seismic data. Computed values of P obtained with the analytical function which fits best chi_k are found ~ 2.7 times larger than those obtained with the gaussian model and reproduce better the solar seismic observations. This non-gaussian description also leads to a Reynolds stress contribution of the same order as the one arising from the advection of the turbulent fluctuations of entropy by the turbulent motions. Some discrepancy between observed and computed P values still exist at high frequency and possible causes for this discrepancy are discussed.
Goupil Marie Jo
Nordlund Aake
Roxburgh Ian
Samadi Reza
Stein Robert F.
No associations
LandOfFree
Numerical 3D constraints on convective eddy time-correlations : consequences for stochastic excitation of solar p modes does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Numerical 3D constraints on convective eddy time-correlations : consequences for stochastic excitation of solar p modes, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Numerical 3D constraints on convective eddy time-correlations : consequences for stochastic excitation of solar p modes will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-698681