Numerical simulations of impulsively excited magnetosonic waves in two parallel solar coronal slabs

¹ Institute of Mathematics and Computer Sciences, The State University in Chełm, ul. Pocztowa 54, 22-100 Chełm, Poland e-mail: rogrodow@pwsz.chelm.pl
² Institute of Physics, UMCS, ul. Radziszewskiego 10, 20-031 Lublin, Poland

Received: 11 May 2006
Accepted: 15 September 2006

Abstract

Aims.We investigate impulsively excited magnetosonic waves in a finely structured coronal loop that is modeled by a system of two parallel strands.

Methods.The equilibrium model is described by the time-dependent ideal magnetodydrodynamic equations that are solved numerically.

Results.Numerical simulations reveal that signatures of these waves in wavelet spectra depend on the distance between the strands and on the position of the initial pulse. In all cases, these spectra display complex structures that correspond to short- and long-period waves. We find that, with increasing distance between the strands, short-period waves dominate the wavelet spectra.

Conclusions.We demonstrate that the presence of a second strand affects wave propagation compared with one strand alone.