BiSON data show change in solar structure with magnetic activity

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We find evidence for an activity-dependent change in solar structure at the second helium ionization zone (similar to 0.98 R-circle dot). We use low-degree p-mode frequencies obtained from 13 years of observations by the Birmingham Solar Oscillations Network (BiSON) to track changes in the amplitude of the rapid-variation signature imposed by the bump in the adiabatic exponent, Gamma(1), at the He II ionization zone. This is the first indication of structural change detected using only low-degree data and confirms the recent results of high-degree and local helioseismic studies.
Original languageEnglish
Pages (from-to)L95-L98
JournalThe Astrophysical Journal
Publication statusPublished - 20 Mar 2006


  • Sun : interior
  • Sun : oscillations


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