Modelling the effect of Meridional Flows in Time-Distance Helioseismology: Born vs. Ray approximation
Kiepenheuer-Institut für Sonnephysik, Freiburg, Germany
Main category
Natural Sciences (Astrophysics and Astrononmy)
Accurate meridional flow measurements are important for understanding the solar dynamo. Recent in- versions for meridional flows have not yet reached a consensus on the nature of the meridional flow in depths greater than about 0.9 solar radii. In time-distance helioseismology, current modelling of the solar interior for meridional flow inversions is performed using ray kernels, which assume that waves propagate along infinitely thin ray paths. The Born approximation may constitute a more accurate approach as it models the first order perturbation to the wave field in the whole solar interior. We present the current status of an undergoing validation of a recently developed model for computing spherical Born approxi- mation sensitivity functions suitable for inferring meridional flows. In addition, we compare Born and ray approximations using flow models.
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