BiSON Data Show Change in Solar Structure with Magnetic Activity

Details BiSON Data Show Change in Solar Structure with Magnetic Activity BiSON Data Show Change in Solar Structure with Magnetic Activity

Mar 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006apj...640l..95v&link_type=abstract

The Astrophysical Journal, Volume 640, Issue 1, pp. L95-L98.

Astronomy and Astrophysics

Astronomy

14

Sun: Interior, Sun: Oscillations

Scientific paper

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.

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