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R. Howe (NSO), J. Christensen-Dalsgaard (TAC/Aarhus U.), F. Hill (NSO), R.W. Komm (NSO), R.M. Larsen (Stanford U.), J. Schou (Stanford U.), M.J. Thompson (QMW, U. London), J. Toomre (U. Colorado)
The combined GONG and MDI medium-degree helioseismic data sets now cover more than 4.5 years and allow us to probe the changing dynamics of the convection zone in unprecedented detail. Here we present the latest results from both projects, showing the evolution of the migrating zonal flows close to the surface and also changes close to and below the base of the convection zone.
This work utilizes data obtained by the Global Oscillation Network Group (GONG) project, managed by the National Solar Observatory, a Division of the National Optical Astronomy Observatories, which is operated by AURA, Inc. under a cooperative agreement with the National Science Foundation. SOHO is a joint project of ESA and NASA.