Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011spd....42.0204b&link_type=abstract
American Astronomical Society, SPD meeting #42, #2.04; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
Measuring the internal magnetic fields of the Sun would provide important constraints on our understanding of the mechanisms that underly solar activity. Using helioseismology, one can in principal detect the effects of magnetic fields on the internal thermal structure, and directly measure magnetic fields through their effects on helioseismic mode propagation. In this work, we have used a full solar cycle's worth of high quality helioseismic data from the Michelson Doppler Imager (MDI) instrument onboard the SOHO spacecraft to explore changes in the interior thermal structure. We find evidence for thermal changes at the base of the convection zone correlated with solar activity. To explain these changes in terms of magnetic fields, we model the effects of magnetic fields on the global mode splitting coefficients. The signal at the base of the convection zone is too small to make a determination of magnetic fields, but we find magnetic fields concentrated in the near-surface layers. We follow this up by looking at the thermal structure of a large number of active regions.
Baldner Charles
Basu Sarbani
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