Abstract
The propagation of magnetoacoustic waves in the solar atmosphere consistingof the photosphere, chromosphere and corona has been studied numericallyby time-dependent multi-dimensional magnetohydrodynamic (MHD)simulation. Pressure disturbances are introduced at the bottom of thechromosphere and at the bottom of the corona, respectively. Thecomputational results show that incurred fast and slow MHD wavespropagate away from the source of the disturbances. The fast MHD wavepropagates as an expansive wave in the radial direction, while the slowone steepens and it may evolve into a slow shock. We suggest that theextreme ultraviolet imaging telescope wave observed by the SOHO andMoreton wave are a fast MHD wave propagating in the corona and in thechromosphere, respectively.
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