BiSON Data Show Change in Solar Structure with Magnetic Activity
Abstract
We find evidence for an activity-dependent change in solar structure at the second helium ionization zone (~0.98 Rsolar). 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, Γ1, 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.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- March 2006
- DOI:
- 10.1086/503101
- Bibcode:
- 2006ApJ...640L..95V
- Keywords:
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- Sun: Interior;
- Sun: Oscillations