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The interaction of acoustic radiation with turbulence
Goldreich, Peter; Kumar, Pawan
AA(California Institute of Technology, Pasadena), AB(California Institute of Technology, Pasadena)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 326, March 1, 1988, p. 462-478. (ApJ Homepage)
Publication Date:
Solar Physics
NASA/STI Keywords:
Magnetohydrodynamic Turbulence, Solar Oscillations, Sound Waves, Turbulent Flow, Absorptivity, Convection, Electrodynamics, Wave Interaction
Bibliographic Code:


The authors derive expressions for the spectral emissivity and absorptivity of acoustic radiation by low Mach number turbulent fluids. They consider three types of turbulence. The first is free turbulence, that is, turbulence which is not subject to external forces. The second and third examples are special cases of forced turbulence, turbulence maintained by stirring with spoons and turbulent pseudoconvection. The resulting formulae are used to estimate the equilibrium energies and quality factors of the acoustic modes in a box which contains turbulent fluid. The scattering of acoustic radiation by the turbulent velocity and pressure fluctuations is treated and the rate at which nonlinear interactions transfer energy among the acoustic modes is evaluated. This work is a first step in the attempt to relate the excitation of the Sun's acoustic modes to the turbulence in the solar convection zone.

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