Numerical simulation of excitation of solar oscillation modes for different turbulent MODELS

L. Jacoutot, A. G. Kosovichev, A. A. Wray, N. N. Mansour

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

The goal of this research is to investigate how well various turbulence models can describe the physical properties of the upper convective boundary layer of the Sun. Accurate modeling of these turbulent motions is necessary for understanding the excitation mechanisms of solar oscillation modes. We have carried out realistic numerical simulations using a hyperviscosity approach and various physical Large-Eddy Simulation (LES) models (Smagorinsky and dynamic models) to investigate how the differences in turbulence modeling affect the damping and excitation of the oscillations and their spectral properties and to compare with observations. We have first calculated the oscillation power spectra of radial and nonradial modes supported by the computational box with the different turbulence models, followed by calculation of the work integral input to the modes to estimate the influence of the turbulence model on the depth and strength of the oscillation sources. We have compared these results with previous studies and with the observed properties of solar oscillations. We find that the dynamic turbulence model provides the best agreement with the helioseismic observations.

Original languageEnglish (US)
Pages (from-to)1386-1391
Number of pages6
JournalAstrophysical Journal
Volume682
Issue number2
DOIs
StatePublished - Aug 1 2008
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • Convection
  • Methods: numerical
  • Sun: oscillations

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