Modelling the effect of Meridional Flows in Time-Distance Helioseismology: Born vs. Ray approximation
Affiliation
Kiepenheuer-Institut für Sonnephysik, Freiburg, Germany
Main category
Natural Sciences (Astrophysics and Astrononmy)
Abstract
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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