Effects of Strong Regular Refraction in the Solar Radio Pulse Structure in Spike Events

We examine the problem related to the scattering of a solar radio pulse in a turbulent coronal plasma, taking into account strong regular refraction. Based on an integral representation of the wave field as an interference integral, we analyze the distortions of the mean profile of the radio pulse in spike events, for the case of the sources located in high coronal arches. It is shown that strong regular refraction of radio emission in the coronal arch plays an important role for pulse structuring during spike events.