The adiabatic exponent in the solar core

J. R. Elliott, A. G. Kosovichev

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51 Scopus citations


We present helioseismic inversions of solar p-mode frequencies obtained by the Michelson Doppler Imager instrument of the Solar Oscillation Investigation project on board SOHO, which indicate a lower central value for the adiabatic exponent Γ1 in the Sun than in current models. We show how the inclusion of relativistic effects in the equation of state removes the discrepancy and allows almost perfect agreement in Γ1 between the models and the Sun. This increases our confidence both in the reliability of the equation-of-state calculation and the determination of solar p-mode frequencies.

Original languageEnglish (US)
Pages (from-to)L199-L202
JournalAstrophysical Journal
Issue number2 PART II
StatePublished - 1998
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • Equation of state
  • Sun: interior
  • Sun: oscillations


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