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Propagation of Coronal Shocks in Fan-Like Magnetic Fields
Recently, Klassen et al. (1999) analyzed two type II bursts observed
on July 9, 1996 and they suggested that this event was caused by two shocks
in different parts of the coronal loop structure. These shocks might be
initiated by two separate sources or by a single source. In the second
case, two shocks might result from a single disturbance due to different
plasma parameters in different propagation directions. We study propagation
of a shock in a fan-like magnetic field structure (2-D analogue of interacting
coronal loops) by the two-dimensional numerical magnetohydrodynamic model.
Explosion of a hot plasma in the coronal arcade model is investigated for
various ratios of the mass density and magnetic field intensity in the
loop-like coronal arcade structure. Ducting of shock waves occurs along
such loops and significant separation of shock front parts is observed.
The presented results support the idea that a single solar flare energy
release can generate coronal disturbances observed as two separate type
II radio bursts.
Authors: D. Odstrcil and M. Karlicky
Organization: Astronomical Institute
Address: 25165 Ondrejov
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