Studying asphericity in the solar sound speed from MDI and GONG data

Details Studying asphericity in the solar sound speed from MDI and GONG data Studying asphericity in the solar sound speed from MDI and GONG data

Jan 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001esasp.464...45a&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,

Computer Science

Sound

4

Sun: Oscillations, Sun: Activity, Sun: Interior

Scientific paper

We study the variation of the frequency splitting coefficients describing the solar asphericity in both GONG and MDI data, and use these data to investigate temporal sound-speed variations as a function of both depth and latitude during the period 1995-2000. The temporal variations in even splitting coefficients are found to be correlated with the corresponding component of magnetic flux at the solar surface. The sound-speed variations associated with the surface magnetic field appear to be superficial. Temporally averaged results show a significant excess in sound speed around r = 0.92 Rsolar and latitude of 60°.

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