Computer simulation of Alfven resonance in a cylindrical, axially bounded flux tube

Astronomy and Astrophysics – Astrophysics

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Computerized Simulation, Magnetic Flux, Magnetohydrodynamic Waves, Plasma Resonance, Solar Corona, Wave Attenuation, Coronal Loops, Magnetic Field Configurations

Scientific paper

The resonant absorption of Alfven waves in an axially bounded cylindrical flux tube is investigated in a dissipative MHD simulation. It is found that in an axially bounded flux tube, in contrast to an infinite periodic model, the resonant frequency is nearly independent of the poloidal component of the magnetic field. This is a consequence of the 'ballooning' structure of the resonant Alfven waves. The scaling with resistivity and viscosity of the width of the resonance layer, the dissipation rate, and the time for steady state absorption to occur, are all in agreement with theory.

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