Astrophysics and Space Science

, Volume 170, Issue 1–2, pp 121–126 | Cite as

Oscillatory behaviour in sunspot umbrae

  • M. A. Aballe Villero
  • J. I. García de la Rosa
  • E. Marco
  • M. Vázquez
Sun and Sun-Like Stars


Using a set of series of spectra of high spectral resoltion corresponding to the same umbra on several days, we have studied the oscillations related to evolution of the two main dark cores of it.

We have detected differences in the behaviour of each core and an evolution in the power spectra not related with the external appearance of the spot. A quite constant value of the ratio of power at five minutes over three minutes has been found.


Power Spectrum Oscillatory Behaviour External Appearance Dark Core 
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.


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  1. Abdelatif, T. E., Lites, B. W., and Thomas, J. H.: 1984, in S. Keil (ed.),Proc. Symp. on Small Scale Dynamical Processes in Quiet Stellar Atmospheres, Nat. Solar Observatory Sacramento Peak, p. 141.Google Scholar
  2. Balthasar, H. and Wiehr, E.: 1984,Solar Phys. 94, 99.Google Scholar
  3. Balthasar, H., Fangmeier, E., Küveler, G., and Wiehr, E.: 1986, in J. Christense-Dalsgaard and S. Frandsen (eds.), ‘Advances in Helio-and Astroseismology’,IAU Symp. 123.Google Scholar
  4. Balthasar, H., Küveler, G., and Wiehr, E.: 1987,Solar Phys.,112, 37.Google Scholar
  5. Beckers, J. M. and Schultz, R. B.: 1972,Solar Phys. 27, 61.Google Scholar
  6. Groth, E. J.: 1972,Astrophys. J. Suppl. Ser. 29, 285.Google Scholar
  7. Lites, B. W. and Thomas, J. H.: 1985,Astrophys. J. 294, 682.Google Scholar
  8. Moore, R. L.: 1981, in L. E. Cram and J. H. Thomas (eds.)The Physics of Sunspots, Sacramento Peak Observatory, Sunspot, p. 259.Google Scholar
  9. Thomas, J. H.: 1981, in L. E. Cram and J. H. Thomas (eds.)The Physics of Sunspots, Sacramento Peak Observatory, Sunspot, p. 345.Google Scholar
  10. Scargle, J. D.: 1982,Astrophys. J. 263, 835.Google Scholar
  11. Schröter, E. H., and Soltaw, D.: 1976,Ann. Astrophys. 49, 463.Google Scholar
  12. Thomas, J. H., Cram, L. E., and Nye, A. H.: 1982,Nature,297, 485.Google Scholar
  13. Thomas, J. H., Lites, B. W., Gurman, J. B., and Ladd, E. F.: 1987,Astrophys. J. 312, 457.Google Scholar
  14. Žugžda, Y. D., Staude, J., and Locāns, V.: 1984,Solar Phys. 91, 219.Google Scholar

Copyright information

© Kluwer Academic Publishers 1990

Authors and Affiliations

  • M. A. Aballe Villero
    • 1
  • J. I. García de la Rosa
    • 1
  • E. Marco
    • 2
  • M. Vázquez
    • 1
  1. 1.Instituto de Astrofisica de CanariasLa Laguna, TenerifeSpain
  2. 2.Dept. Matemàtica Aplicada i AstronomiaUniv. de ValenciaBurjassotSpain

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