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The spectrum of solar p-modes and the solar activity cycle

  • P. L. Pallé
  • C. Régulo
  • T. Roca Cortés
Part IV Observations of Solar Oscillations
Part of the Lecture Notes in Physics book series (LNP, volume 367)

Abstract

Solar cycle variations on the power and frequencies of the low l p-mode solar acoustic oscillations are investigated using an extensive set of observations obtained at Observatorio del Teide (Izaña, Tenerife). The radial velocity of integrated sunlight has been monitored, by means of a resonant scattering spectrophotometer, at several epochs (basically each year) from 1977 to 1989. The latest data (1988 and 1989) confirm previously found results (Pallé et al., 1988, 1989a,b):
  1. a)

    A variation of nearly 40% peak to peak in the power of the low l solar p-modes, being higher when the solar activity is at its minimum.

     
  2. b)

    A null variation in frequency for l = 0 and a decrease of ≈ 0.5 µ.Hz for l = 1 when solar activity goes from maximum to minimum (similar results for l = 2 and l = 3) by using a cross-correlation technique.

     

Keywords

Solar Activity Solar Cycle Duty Cycle Acoustic Mode Solar Activity Cycle 
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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References

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Copyright information

© Springer-Verlag 1990

Authors and Affiliations

  • P. L. Pallé
    • 1
  • C. Régulo
    • 1
  • T. Roca Cortés
    • 1
  1. 1.Instituto de Astrofísica de CanariasLa Laguna, TenerifeSpain

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