Helioseismic signatures of localized structural discontinuities in BiSON and GONG data

Details Helioseismic signatures of localized structural discontinuities in BiSON and GONG data Helioseismic signatures of localized structural discontinuities in BiSON and GONG data

Jan 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001esasp.464...79c&link_type=abstract

In: Proceedings of the SOHO 10/GONG 2000 Workshop: Helio- and asteroseismology at the dawn of the millennium, 2-6 October 2000,

Physics

1

Sun: Activity, Sun: Oscillations

Scientific paper

We use high-quality helioseismic data collected by BiSON and GONG in an attempt to search for variations over time of the influence on the acoustic mode frequencies of localized structural perturbations located beneath the solar surface. Our analysis of the BiSON data is aimed at a study of the effects of the He II ionization zone. We use GONG data (4 <= l <= 140) to extract estimates of the solar-cycle-induced eigenfrequency shifts over the range 1600 <= ν <= 4000 μHz. A careful analysis of these data may have uncovered tentative evidence for an oscillatory behaviour that would be the signature of a time-dependent solar cycle perturbation located approximately ~20 Mm beneath the photosphere.

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