34th Solar Physics Division Meeting, June 2003
Session 26 The Changing Solar interior II
Oral, Friday, June 20, 2003, 9:00am-12:00noon, Auditorium

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[26.11] Searching for Deep Changes of the Solar Structure

A. G. Kosovichev (Stanford University)

A relation between normal-mode and multiple-reflection time-distance data is derived by applying the principle of stationary phase to solar acoustic oscillations. This relation links the global and local helioseismology data, and provides estimates of acoustic travel times in terms of mode frequencies. It is employed for searching solar-cycle variations in the tachocline, by using GONG and MDI data of 1996-2002. The time-distance signature of magnetic field at the base of the convection zone recently reported by Chou and Serebryanskiy (2002) and the current precision of the deep changes are discussed.

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Bulletin of the American Astronomical Society, 35 #3
© 2003. The American Astronomical Soceity.