Zebra-structure of solar microwave bursts

The dynamic spectrum of radio emission is used for diagnostics of geo-affectivity of solar flares. But sometimes the spectrum contains many stripes of radiation named as zebra-pattern, the origin of which is not clear. The great number of hypotheses of its origin is published but all of them do not take into account the change of signal during its propagation through a corona. The presented analysis showed that the effects of propagation can form the dynamic spectrum containing zebra-patterns. The properties of designed spectrum coincide with basic properties of the observed spectrum. It is found out that a ldquospikerdquo structure of strips is a natural property of radio wave interference and its existence indicates the interference nature of formation of a zebra-pattern. Consequently the zebra pattern can be formed not in a source of emission, but can arise up as a result of radio wave propagation through the inhomogeneous refractive coronal medium.