3D Numerical Simulations of fMode Propagation Through Magnetic Flux Tubes
Abstract
Threedimensional numerical simulations have been used to study the scattering of a surfacegravity wave packet by vertical magneticflux tubes, with radii from 200 km to 3 Mm, embedded in stratified polytropic atmosphere. The scattered wave has been found to consist primarily of m=0 (axisymmetric) and m=1 modes. The ratio of the amplitude of these two modes was found to be strongly dependent 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 to understand the seismic signature of flux tubes, which have recently begun to be observed.
 Publication:

Solar Physics
 Pub Date:
 February 2011
 DOI:
 10.1007/s1120701096665
 arXiv:
 arXiv:1008.2531
 Bibcode:
 2011SoPh..268..309D
 Keywords:

 Helioseismology;
 direct modeling;
 Magnetic fields;
 Waves;
 magnetohydrodynamic;
 Astrophysics  Solar and Stellar Astrophysics
 EPrint:
 14 pages, 10 figures, accepted for Solar Physics (Topical issue in Helio and Asteroseismology 2010)