Scattering of acoustic waves by a magnetic cylinder

Details Scattering of acoustic waves by a magnetic cylinder Scattering of acoustic waves by a magnetic cylinder

2008-03-26

arxiv.org/abs/0803.3839v1

Astrophys.J.643:549-555,2006

Astronomy and Astrophysics

Astrophysics

Scientific paper

10.1086/502623

With the aim of studying magnetic effects in time-distance helioseismology, we use the first-order Born approximation to compute the scattering of acoustic plane waves by a magnetic cylinder embedded in a uniform medium. We show, by comparison with the exact solution, that the travel-time shifts computed in the Born approximation are everywhere valid to first order in the ratio of the magnetic to the gas pressures. We also show that, for arbitrary magnetic field strength, the Born approximation is not valid in the limit where the radius of the magnetic cylinder tends to zero.

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