3D Numerical Simulations of f-Mode Propagation Through Magnetic Flux Tubes

Details 3D Numerical Simulations of f-Mode Propagation Through Magnetic Flux Tubes 3D Numerical Simulations of f-Mode Propagation Through Magnetic Flux Tubes

2010-08-15

arxiv.org/abs/1008.2531v2

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

14 pages, 10 figures, accepted for Solar Physics (Topical issue in Helio- and Asteroseismology 2010)

Scientific paper

10.1007/s11207-010-9666-5

Three-dimensional numerical simulations have been used to study the scattering of a surface-gravity wave packet by vertical magnetic flux tubes, with radii from 200 km to 3 Mm, embedded in stratified polytropic atmosphere. The scattered wave was found to consist primarily of m=0 (axisymmetric) and m=1 modes. It was found that the ratio of the amplitude of these two modes is strongly dependant on the radius of the flux tube: The kink mode is the dominant mode excited in tubes with a small radius while the sausage mode is dominant for large tubes. Simulations of this type provide a simple, efficient and robust way to start understanding the seismic signature of flux tubes, which have recently began to be observed.

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