Helioseismic Tomography

Details Helioseismic Tomography Helioseismic Tomography

Nov 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...471.1030d&link_type=abstract

Astrophysical Journal v.471, p.1030

Astronomy and Astrophysics

Astronomy

19

Sun: Interior, Sun: Oscillations

Scientific paper

"Helioseismic tomography" is a method using observations to construct slices of the Sun's internal structure. It is based on a reduction of observations to time-distance surfaces and hypersurfaces. We present a procedure for measuring time-distance surfaces and hypersurfaces, and thereby a method of studying localized inhomogeneities in the interior of the Sun, such as abnormalities in the sound speed (e.g., a thermal shadow, Parker 1987a), or local subsurface flows, or magnetic fields. We also present a simulation of measuring time-distance surfaces and illustrate how to measure the size of an inhomogeneity, its location in depth, and the deviation of its sound speed compared to its local surroundings.

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