Foreshortened short-wave scattering on artificial ionospheric inhomogeneities

Synchronous slant soundings of the ionosphere were performed in April, May and September of 1982 in the morning and evening hours. Reflections observed on the diagrams as a mode with a delay relative to the 1F2 mode were recorded only on the Murmansk-Kiev path, not the Leningrad-Kiev, Moscow-Kiev or Kheys island-Kiev paths. The observations of the foreshortening mode indicate that it develops when the heating frequency is 81 to 88% of the critical frequency of the F2 layer at the heated point. It is found that the slant sounding equipment is effective for the study of foreshortening scattering of radio waves on artificial ionospheric inhomogeneities created by powerful shortwave transmitters. Foreshortening modes are observed with a mean probability of 34.8% over the Murmansk-Kiev path at frequencies of 0.5-6 MHz.