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Helioseismology: the Sun as a Strongly-Constrained, Weakly-Coupled Plasma

Published online by Cambridge University Press:  12 April 2016

W. Däppen
W. Däppen*
Affiliation:
Department of Physics and Astronomy, University of Southern California, Los Angeles, CA 90089-1342, USA

Abstract

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Accurate measurements of observed frequencies of solar oscillations are providing a wealth of data on the properties of the solar interior. The frequencies depend on the solar structure, and on the properties of the plasma in the Sun. Except in the very outer layers, the stratification of the convection zone is almost adiabatic. There, the sound-speed profile is governed principally by the specific entropy, the (homogenous) chemical composition and the equation of state. It is therefore essentially independent of the uncertainties in the radiative opacities. The sensitivity of the observed frequencies is such that it enables to distinguish rather subtle features of the equation of state. An example is the signature of the heavy elements in the equation of state. This opens the possibility to use the Sun as a laboratory for thermodynamic properties.

Type
Reviews
Information
International Astronomical Union Colloquium , Volume 147: The Equation of State in Astrophysics , 1994 , pp. 368 - 393
Copyright
Copyright © Cambridge University Press 1994

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