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The 13 day period oscillation and the solar cycle

Published online by Cambridge University Press:  03 August 2017

A. Jiménez ,
P.L. Pallé ,
C. Régulo ,
T. Roca Cortés ,
G.R. Isaak ,
C.P. McLeod  and
H.B. van der Raay
A. Jiménez
Affiliation:
Instituto de Astrofisica de Canarias, Universidad de La Laguna, Tenerife, Spain
P.L. Pallé
Affiliation:
Instituto de Astrofisica de Canarias, Universidad de La Laguna, Tenerife, Spain
C. Régulo
Affiliation:
Instituto de Astrofisica de Canarias, Universidad de La Laguna, Tenerife, Spain
T. Roca Cortés
Affiliation:
Instituto de Astrofisica de Canarias, Universidad de La Laguna, Tenerife, Spain
G.R. Isaak
Affiliation:
Department of Physics, University of Birmingham, U.K.
C.P. McLeod
Affiliation:
Department of Physics, University of Birmingham, U.K.
H.B. van der Raay
Affiliation:
Department of Physics, University of Birmingham, U.K.

Abstract

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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.

Type
Chapter 3: Longterm Variations in the Sun
Information
Symposium - International Astronomical Union , Volume 123: Advances In Hello- and Asteroseismology , 1988 , pp. 211 - 214
Copyright
Copyright © Reidel 1988 

References

Claverie, A., Isaak, G. R., McLeod, C. P., Van der Raay, H. B., Palle, P. L., Roca Cortes, T., 1982, Nature, 299, 704 Google Scholar
Herrero, A., Jimenez, R., Roca Cortés, T.: 1983. Mem. della Soc. Ast. Ital., 55, 33 Google Scholar
Solar Geophysical Data. Data Centre, Boulder, U.S.A. Google Scholar