[ascl:1105.009]
Ray Tracing Codes: run_tau, run_raypath, and ray_kernel

Time-distance helioseismology aims to measure and interpret the travel times of waves propagating between two points located on the solar surface. The travel times are then inverted to infer sub-surface properties that are encoded in the measurements. The trajectory of the waves generally follows that of the infinite-frequency ray path, although they are sensitive to perturbations off of this path. Finite-frequency sensitivity kernels are thus needed to give more accurate inversion results.

Ray tracing codes calculate travel time kernels for a ray. There are three main codes which calculate the group time as a function of distance, the ray paths as well as the phase and group times along the path, and the ray kernels for the sound speed squared.

- Code site:
- http://www2.mps.mpg.de/projects/seismo/NA4/MODEL/travel_time.html
- Described in:
- http://www2.mps.mpg.de/projects/seismo/software/BIRCH/dissertation/

- Bibcode:
- 2011ascl.soft05009B

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