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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

Abstract

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.

Keywords

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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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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