Linear Sensitivity of Helioseismic Travel Times to Local Flows

Details Linear Sensitivity of Helioseismic Travel Times to Local Flows Linear Sensitivity of Helioseismic Travel Times to Local Flows

2010-02-11

arxiv.org/abs/1002.2338v1

Astronomische Nachrichten, Volume 328, Issue 3, page 228, 2007

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

6 pages, 6 figures

Scientific paper

10.1002/asna.200610724

Time-distance helioseismology is a technique for measuring the time for waves to travel from one point on the solar surface to another. These wave travel times are affected by advection by subsurface flows. Inferences of plasma flows based on observed travel times depend critically on the ability to accurately model the effects of subsurface flows on time-distance measurements. We present a Born approximation based computation of the sensitivity of time distance travel times to weak, steady, inhomogeneous subsurface flows. Three sensitivity functions are obtained, one for each component of the 3D vector flow. We show that the depth sensitivity of travel times to horizontally uniform flows is given approximately by the kinetic energy density of the oscillation modes which contribute to the travel times. For flows with strong depth dependence, the Born approximation can give substantially different results than the ray approximation.

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