Talk abstract details

An important aspect of time-distance helioseismology is the calculation of travel-time sensitivity kernels for thermodynamic variables, velocity flows, and magnetic fields. We use the first-order Born approximation to derive and compute a set of 3D kernel functions, which give the sensitivity of travel-time measurements to the presence of density, pressure, and sound-speed perturbations with respect to a horizontally-invariant background solar model. Kernels for sound-speed perturbations have been studied previously and here we compare them to the kernels for density and pressure. In combination with inversions of the travel-times, this work will be useful to probe subsurface structure.