Fitting Travel Times
The purpose of time-distance helioseismology is to calculate the travel time of solar waves between two surface points. The basic way to do this is to calculate the cross-covariance between the signal at the two points. The travel times are measured by fitting wavelets to the cross-covariance.
These IDL routines for measuring travel times from cross correlations. Two methods are implemented: a Gabor-wavelet fit and a one-parameter fit.
Fitting travel times (tar file)
Documentation: Measuring helioseismic travel times (2007) M. Roth, L. Gizon, J.G. Beck, Astron. Nachr. 328, 215-222