Overstable solar oscillations of intermediate and high degree

Details Overstable solar oscillations of intermediate and high degree Overstable solar oscillations of intermediate and high degree

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mmsai..55..175a&link_type=abstract

(European Physical Society, Ministero della Pubblica Istruzione, and Universita di Catania, EPS Study Conference on Oscillations

Astronomy and Astrophysics

Astronomy

1

Dynamic Stability, Solar Oscillations, Stable Oscillations, Turbulence Effects, Vibration Mode, Plasma Conductivity, Stellar Envelopes, Viscosity

Scientific paper

The stability of linear acoustic modes trapped in the solar envelope is investigated with the thermal and mechanical effects of turbulence on the mean flow incorporated through turbulent conductivity, viscosity and turbulent pressure. A number of these modes turn out to be overstable, and the most rapidly growing acoustic modes are found to occupy a region centred around 3.2 mHz and spread over a wide range of length scales. These numerical results are in reasonable accord with the observed power-spectrum of the five-minute oscillations.

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