Topic/Type: 1.1 Space & astrophysical plasmas, Poster

Impulsively generated wave trains in a solar coronal loop

P. Jel?nek1, 2, M. Karlicky2

1 University of South Bohemia, Faculty of Science, Česk? Budějovice, Czech Republic
2 Academy of Sciences of the Czech Republic, Astronomical Institute, Ondřejov, Czech Republic

Impulsively generated fast magneto-acoustic wave trains in a solar coronal loop are numerically studied. The problem is considered as two-dimensional in space and for the description the full set of magnetohydrodynamic (MHD) equations is used. The numerical solution of MHD equations is performed by means of Lax-Wendroff algorithm on uniformly structured mesh. The wavelet analysis of obtained wave trains shows out the typical tadpole shapes, i.e. a narrow tail followed by a broad-band head. In presented contribution we discuss the propagation speed and periods of wave trains as well as the shapes of tadpoles in dependence on the plasma beta parameter. These studies are very important in connection with observations because the tadpole signatures, firstly discovered during the solar eclipse in 1999 by SECIS instrument, were recently recognized also in decimetric type IV radio event by the Ondřejov radiospectrograph.