학술논문
3D Numerical Simulations of f-Mode Propagation Through Magnetic Flux Tubes.
Document Type
Article
Author
Source
Subject
*SOLAR magnetic fields
*COMPUTER simulation
*MAGNETIC flux
*HELIOSEISMOLOGY
*MATHEMATICAL models
*SOLAR atmosphere
*MAGNETOHYDRODYNAMICS
*SOLAR gravity
*SUN
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Language
ISSN
0038-0938
Abstract
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 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. [ABSTRACT FROM AUTHOR]