We present evidence that solar structure changes with changes in solar activity. We find that the adiabatic index, Γ 1 , changes near the second helium ionization, i.e., at a depth of about 0.98 R ☉ . We believe that this change is a result of the change in the effective equation of state caused by magnetic fields. Inversions should be able to detect the changes in Γ 1 if mode sets with reliable and precise high-degree modes are available.
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