Attention is paid to evolution of a wide-spectrum pulse.
As different spectral components of the pulse propagate with different phase and group speeds, due to a dispersion brought by the random field, the pulse shape evolves in time. Our aim is to determine a typical profile of the small-amplitude pulse which interacts with randomly distributed coronal structures. The code utilizes the Godunov-type method which yields accurate results near steep profiles and complex flows. The computational domain has a typical dimension and is divided into a grid of at least 20000 cells. At the left and right boundaries free-streaming conditions are applied.