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Seismic Evidence of Modulation of the Structure and Angular Velocity of the Sun Associated with the Solar Cycle

Published online by Cambridge University Press:  12 April 2016

D.O. Gough ,
A.G. Kosovichev ,
T. Sekii ,
K.G. Libbrecht  and
M.F. Woodard
D.O. Gough
Affiliation:
Institute of Astronomy, Madingley Road, Cambridge CB3 0HA, England
A.G. Kosovichev
Affiliation:
Institute of Astronomy, Madingley Road, Cambridge CB3 0HA, England
T. Sekii
Affiliation:
Institute of Astronomy, Madingley Road, Cambridge CB3 0HA, England
K.G. Libbrecht
Affiliation:
Big Bear Solar Observatory, California Institute of Technology, Pasadena, CA 91125, USA
M.F. Woodard
Affiliation:
Big Bear Solar Observatory, California Institute of Technology, Pasadena, CA 91125, USA

Extract

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Solar p-mode multiplet oscillation frequencies and expansion coefficients for degeneracy splitting have been measured in the summers of 1986 and 1988–1990. Temporal variations not unlike the differences between 1988 and 1986 reported by Libbrecht & Woodard (1990) continue into 1990. These differences are possibly associated with the solar cycle. We report here on our first findings about the variation of the internal angular velocity and asphericity deduced from these frequency differences.

Type
I. Setting the stage: Sun, Stars Galaxies and the Universe
Information
International Astronomical Union Colloquium , Volume 137: Inside the Stars , 1993 , pp. 93 - 96
Copyright
Copyright © Astronomical Society of the Pacific 1993

References

Gough, D.O. & Stark, P.B. 1992, Astrophys. J. (in preparation)Google Scholar
Libbrecht, K.G. 1989, Astrophys. J., 336, 413 Google Scholar
Libbrecht, K.G. & Woodard, M.F. 1990, in Progress of seismology of the sun and stars (eds. Osaki, Y. & Shibahashi, H.) Heidelberg: Springer, p. 145 CrossRefGoogle Scholar