Magnetohydrodynamic shock propagation in the vicinity of a magnetic neutral sheet

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Neutral Sheets, Shock Wave Propagation, Solar Corona, Solar Cosmic Rays, Solar Magnetic Field, Solar Wind, H Alpha Line, Magnetohydrodynamic Waves, Shock Wave Interaction, Solar Flares, Solar Protons

Scientific paper

This paper reports a numerical investigation of the propagation of magnetohydrodynamic (MHD) shocks in the vicinity of magnetic neutral sheets. The attenuation of a shock after passing through a neutral sheet has been evaluated (assuming infinite electrical conductivity). In a parameter study, values of shock speed, polytropic index, plasma beta, and neutral-sheet thickness which are representative of solar coronal conditions have been examined. If solar cosmic rays are accelerated in association with a flare-induced shock (as seems most likely), then our results suggest that the spatial structure of solar particle sources will be influenced by helmet streamers. Such streamers are most readily detectable by H alpha filaments in the underlying chromosphere.

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