Time-distance: what does it tell us?

Details Time-distance: what does it tell us? Time-distance: what does it tell us?

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.517...61j&link_type=abstract

In: Proceedings of SOHO 12 / GONG+ 2002. Local and global helioseismology: the present and future, 27 October - 1 November 2002,

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Helioseismology

Scientific paper

Time-distance helioseismology has become a very important tool for investigating phenomena in the solar convection zone such as convection cells, meridional flows and active regions. Using time-distance helioseismology it has become possible to study these phenomena in unprecedented detail. In this review I will discuss some of the results obtained using time-distance helioseismology and how they compare with results obtained from other local-area helioseismic methods. When more than one of local-area helioseismic methods, e.g. time-distance, holography and ring-diagram analysis, can be applied to the same problem the information obtained is increased. One of the future goals of local-area helioseismology will be to interpret the same phenomena using all the available methods. Time-distance data have been inverted using tomographic techniques to reconstruct the conditions in the solar interior. The accuracy of this reconstruction depends both on the sensitivity kernels and the inversion methods employed. I will show some results obtained using different kernels and inversion methods. The similarities between the results ensure that what we are seeing are not artifacts introduced by the inversion procedure. To understand better the inversion results, averaging kernels and estimations of the model uncertainty are needed; these illustrate the resolution and precision that may be achieved with the inversion methods. I will show examples of such resolution analysis. To test the inversion methods independent forward modeling is needed. Preliminary results from an acoustic solar-like model will be presented.

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