Computer Science – Sound
Scientific paper
Apr 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982soph...77..303a&link_type=abstract
Solar Physics, vol. 77, Apr. 1982, p. 303-327.
Computer Science
Sound
26
Acoustic Instability, Solar Granulation, Solar Oscillations, Stellar Models, Conductive Heat Transfer, Convection, Frequency Stability, Linear Systems, Prandtl Number, Sound Waves, Tables (Data), Trapping, Turbulence, Viscosity
Scientific paper
The stability of linear convective and acoustic modes in solar envelope models is investigated by taking into account the interaction between convection and pulsation in an approximate manner through the turbulent heat conductivity and turbulent viscosities. The scales of motion corresponding to granulation, supergranulation and five-minute oscillations are obtained with a reasonable value of the turbulent Prandtl number. Many of the acoustic modes trapped in the solar convective zone are found to be overstable, and the most rapidly growing modes occupy a region centered around a period of 300 s, spreading over a wide range of horizontal scales from several thousand to a few tens of thousand km. It is concluded that the simultaneous operation of the kappa-mechanism and the turbulent conduction (convective Cowling) mechanism is responsible for exciting the five-minute oscillations.
Antia H. M.
Chitre S. M.
Narasimha D.
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