Statistics – Computation
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.255..603b&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 255, April 15, 1992, p. 603-649.
Statistics
Computation
146
Convection, Mixing Length Flow Theory, Radiative Transfer, Solar Atmosphere, Solar Oscillations, Thermodynamic Equilibrium, Eddington Approximation, Frequency Distribution, Power Spectra, Radiation Distribution, Wave Equations
Scientific paper
The linear stability of the solar pulsation modes is addressed. A time-dependent, nonlocal mixing-length prescription for convection and the Eddington approximation are employed to study radiative transfer. Results reveal that low-degree acoustic modes are damped, and the theoretical damping rates are in good agreement with measurements of solar oscillation line widths. The computational technique for linear stability analysis is used to gauge the degree of error incurred in employing two standard approximations. The assumption of adiabatic stress-free motion is considered to be less severe than errors likely to occur in modeling the solar superdiabatic boundary layer by conventional formulations of mixing-length theory. Prescriptions modeling solar five-minute oscillations intrinsically damped and excited as a consequence of the emission of acoustic radiation by turbulent convective flows are used to estimate modal mean amplitudes.
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