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The solar oscillations spectrum and the solar cycle

Published online by Cambridge University Press:  03 August 2017

A. Jiménez ,
P.L. Pallé ,
J.C. Pérez ,
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
J.C. Pérez
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, UK
C.P. McLeod
Affiliation:
Department of Physics, University of Birmingham, UK
H.B. van der Raay
Affiliation:
Department of Physics, University of Birmingham, UK

Abstract

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During the summer seasons of the years 1977 to 1985 daily velocity measurements of solar global oscillations have been obtained using a resonant scattering spectrometer. After calculating the power spectra of the daily residuals, the mean for each season is found. Several discrete frequency intervals are defined in the spectrum which yield information on the characteristics of the oscillations and noise levels. The mean power in these intervals and the cut-off frequency of the p-mode spectrum, determined for each year, are correlated with the solar activity cycle. Furthermore, several series of 13 contiguous days for each year are analyzed. The frequency and amplitude of the p modes of 1 ≤ 3 and 11 ≤ n ≤ 33 are determined and their average for these years is found. The frequency differences between modes of the same degree 1 and between neighbouring modes are found. Their variation over the years is compared with the solar activity cycle.

Type
Chapter 3: Longterm Variations in the Sun
Information
Symposium - International Astronomical Union , Volume 123: Advances In Hello- and Asteroseismology , 1988 , pp. 205 - 209
Copyright
Copyright © Reidel 1988 

References

- Brookes, J.R., Isaak, G.R., van der Raay, H.B.: 1978. MNRAS, 185, 1 CrossRefGoogle Scholar
- Pallé, P.L., Pérez, J.C., Régulo, C., Roca Cortés, T., Issak, G.R., Mc Leod, C.P., van der Raay, H.B.: 1986a. Astron. & Astroph, (in press) Google Scholar
- Pallé, P.L., Pérez, J.C., Régulo, C., Roca Cortés, T., Issak, G.R., Mc Leod, C.P., van der Raay, H.B.: 1986b. Astron. & Astroph, (in press) Google Scholar