Modelling the Line-of-Sight Projection and Filtering-Induced Leakage in Time-Distance Helioseismology
Kiepenheuer-Institut für Sonnenphysik
Natural Sciences (Astrophysics and Astrononmy)
Natural Sciences (Physics)
In current approaches to time-distance helioseismology, the line-of-sight projection effect on the traveltimes
is not fully taken into account. Furthermore, filtering of full-disc data induces leakage due to the
projection onto the CCD, which has so far not been accounted for. We develop a theoretical approach
to consider these effects when computing sensitivity functions. As the formulas obtained do not seem to
give results for spherical Born approximation sensitivity functions in a reasonable computation time, we
develop tests to estimate the strength of the effects.
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