The five-minute oscillations in the solar atmosphere
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.
- Publication:
-
Solar Physics
- Pub Date:
- July 1975
- DOI:
- 10.1007/BF00155141
- Bibcode:
- 1975SoPh...43...49C
- Keywords:
-
- Acoustic Excitation;
- Atmospheric Models;
- Oscillations;
- Solar Atmosphere;
- Velocity Distribution;
- Astronomical Models;
- Polytropic Processes;
- Radiative Transfer;
- Self Oscillation;
- Thermal Instability;
- Solar Physics;
- Solar Atmosphere;
- Convection Zone;
- Dimensionless Wave Number;
- Unstable Layer;
- Radiative Conductivity