Other
Scientific paper
May 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...194.2102g&link_type=abstract
American Astronomical Society, 194th AAS Meeting, #21.02; Bulletin of the American Astronomical Society, Vol. 31, p.858
Other
Scientific paper
Over the past thirty years, helioseismology has proven to be an extremely useful tool for probing the solar interior. Using global mode frequencies, the structure and the rotation of the Sun have been determined with unprecedented accuracy. More recently, there has been rapid evolution of so-called "local" methods in helioseismology. These techniques are able to examine aspects of the Sun's structure and dynamics which are otherwise inaccessible. One of the most successful of these techniques is time-distance helioseismology, which relies on the determination of wave travel times to infer properties of the subsurface region. This approach has been particularly successful in measuring flows in the solar convection zone which were previously observable only at the surface. In this paper we present our most recent results in these investigations, including our latest determination of the meridional circulation as a function of depth, and our search for large-scale nonaxisymmetric velocity structures. Data for this research was obtained by the MDI instrument on SOHO. This research is supported by NASA contract NAG5-3077 at Stanford University.
Duvall Thomas L. Jr.
Giles Peter Mark
Scherrer Philip H.
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