Physics
Scientific paper
Jan 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001esasp.464..149k&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,
Physics
3
Sun: Oscillations, Time-Distance
Scientific paper
Time-distance analysis has proven to be a powerful and intuitively self evident approach for local helioseismology. By directly measuring propagation times of wave packets between selected locations at the surface, and their variations over a specific area of the sun, a directed diagnostic of the physical properties of that region can be achieved. The empirical approach taken by most investigators appears to be robust and has produced enticing results. But surprisingly, the theoretical framework for time-distance seismology remains sketchy. At the same time, rigorous inversion methodologies need to be further developed and validated; and, as in any inverse problem, the topology of the underlying anihilator must be well understood to adequately interpret the inferred properties. Using simulated observables and focusing on the inference of the velocity flow, I illustrate the diagnostic potential of time-distance inversion and its limitation with simple and realistic simulations. I also present inversions based on actual observations obtained with the MDI instrument on board SOHO.
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