Solar Five-minute Oscillations of Low, Intermediate, and High Degree

  • H. M. Antia
  • S. M. Chitre
  • D. Narashima


The overstability of acoustic modes trapped inside the Sun is studied with mechanical and thermal effects of turbulence included in an approximate manner through the eddy diffusivities. Many of the acoustic modes are found to be overstable with the most rapidly growing modes occupying a region centred around 3.3 mHz and spread over a wide range of length-scales. The numerical results turn out to be in reasonable accord with the observed power-spectrum of the five-minute oscillations of arbitrary degree. It is demonstrated that these oscillations are most likely to be driven by a simultaneous operation of the κ-mechanism and the convective Cowling mechanism, the dominant contribution to the generation of self-excited acoustic waves arising from the turbulent diffusion.


Solar Phys Convection Zone Eddy Diffusivity Acoustic Mode Turbulent Convection 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. Ando, H. and Osaki, Y.: 1975, Publ. Astron. Soc. Japan 27, 581.ADSGoogle Scholar
  2. Antia, H. M., Chitre, S. M., and Narashima, D.: 1982, Solar Phys. 77, 303.ADSCrossRefGoogle Scholar
  3. Antia, H. M., Chitre, S. M., and Narashima, D.: 1983, Monthly Notices Roy. Astron. Soc. , 865.Google Scholar
  4. Claverie, A., Isaak, G. R., McLeod, C. P., van der Raay, H. B., and Roca Cortes, T.: 1981, Nature 293, 443.ADSCrossRefGoogle Scholar
  5. Deubner, F.-L.: 1975, Astron. Astrophys. 44, 371.ADSGoogle Scholar
  6. Deubner, F.-L., Ulrich, R. K., and Rhodes, E. J., Jr.: 1979, Astron. Astrophys. 72, 177.ADSGoogle Scholar
  7. Duvall, T. L., Jr. and Harvey, J. W.: 1983, Nature 302, 24.ADSCrossRefGoogle Scholar
  8. Goldreich, P. and Keeley, D. A.: 1977, Astrophys. J. 211, 934.ADSCrossRefGoogle Scholar
  9. Grec, G., Fossat, E., and Pomerantz, M.: 1983, Solar Phys. 82, 55.ADSCrossRefGoogle Scholar
  10. Leighton, R. B., Noyes, R. W., and Simon, G. W.: 1962, Astrophys. J. 135, 474.ADSCrossRefGoogle Scholar
  11. Ulrich, R. K. and Rhodes, E. J., Jr.: 1977, Astrophys. J. 218, 521.ADSCrossRefGoogle Scholar
  12. Unno, W.: 1976, in E. A. Spiegel and J. P. Zahn (eds.), ‘Problems of Stellar Convection’, IAU Colloq. 38, 315.Google Scholar

Copyright information

© D. Reidel Publishing Company 1986

Authors and Affiliations

  • H. M. Antia
    • 1
  • S. M. Chitre
    • 1
  • D. Narashima
    • 1
  1. 1.Tata Institute of Fundamental ResearchBombayIndia

Personalised recommendations