The five-minute oscillations in the solar atmosphere |
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| Authors: | S M Chitre M H Gokhale |
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| Institution: | 1. Tata Institute of Fundamental Research, 400 005, Bombay, India
2. Physical Research Laboratory, 380 009, Ahmedabad, India
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| Abstract: | The acoustic overstability in a polytropic plane-parallel atmosphere with superadiabatic temperature gradient and radiative dissipation is demonstrated for optically thick disturbances. The periods of oscillation are found to be in the range 250–480 s and the associated wavelength of the order of 4000 km. The five-minute oscillations in the solar surface are attributed to self-excited sound waves in a layer in the subphotospheric convection zone of about 1000 km thickness. |
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