The 13 Day Period Oscillation and the Solar Cycle

Conference paper
Part of the International Astronomical Union / Union Astronomique Internationale book series (IAUS, volume 123)


From the analysis of radial velocity measurements of the Sun obtained at Izaña during long observing seasons covering ten years, from 1976 to 1985, stable periods longer than 1 day, have been found in the observed signal. In particular the appearance of an oscillation with a 13 day period, discovered by Claverie et al (1982), has been confirmed. The comparison, for 1981 – 82 – 83 and 84, of the observations with a calibrated numerical model of the passage of inhomogeneities (spots and plages) on the solar surface, shows that the signal is not only due to this effect. The obtained signal from the model has a phase lag of almost two days relative to the observed one. So, it is believed that another velocity field, probably related to the surface inhomogeneities, contributes to the observed signal.


Solar Cycle Solar Surface Normalize Cross Correlation Radial Velocity Measurement Solar Geophysical Data 
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Copyright information

© International Astronomical Union 1988

Authors and Affiliations

  1. 1.Instituto de Astrofísica de CanariasUniversidad de La LagunaTenerifeSpain
  2. 2.Department of PhysicsUniversity of BirminghamUK

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