The aim of our work was to study the spatial structure of inhomogeneities of interstellar plasma in the directions of five pulsars : B0823+26 , B0834+06 , B1237+25 , B1929+10 , and B2016+28 .
Observations of these pulsars were made with RadioAstron space-ground radio interferometer at 324 MHz .
We measured the angular size of the scattering disks to be in range between 0.63 and 3.2 mas .
We determined the position of scattering screens on the line of sight .
Independent estimates of the distances to the screens were made from the curvature of parabolic arcs revealed in the secondary spectra of four pulsars .
The model of uniform distribution of inhomogeneities on the line of sight is not suitable .
According to the results , we came to the conclusion that scattering is mainly produced by compact plasma layers and the uniform model of inhomogeneties distribution on the line of sight in not applicable .