CROSS-TALK IN SOLAR CORONAL LOOPS

The temporal evolution of magnetohydrodynamic waves in solar coronal l oops is studied by means of numerical simulations. Coronal loops am re presented by smoothed slabs of enhanced gas density embedded within a uniform magnetic field. The simulations show that for a smoothed densi ty profile them is an energy leakage from the slab, associated with th e propagation of sausage and kink waves. This leakage is responsible f or a cross-talk between two parallel stabs. It is found that the prese nce of a second slab causes an asymmetry in the flow which is perpendi cular to the slabs. This asymmetry is a result of a total reflection w hich occurs at the second slab and causes wave trapping. As the kink w ave is mom robust than the sausage wave, the kink-kink wave interactio n is weak whereas the sausage-kink wave interaction can lead to a dest ruction of the sausage wave. Impulsively generated waves in the parall el slabs exhibit periodic, quasi-periodic and decay phases in an accor dance with some observations. Time-signatures of such waves am mom com plicated than for an isolated slab as a presence of the second slab ca uses the wave propagation asymmetric.