The results of experimental studies of the spatial structure of the disturbed region of the ionosphere

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   The paper considers some features of ionospheric artificial turgulence
   (IAT) generation at mid-latitudes in the conditions of day and night
   ionosphere. It was shown that IAT low intensity during daytime is
   determined by powerful radio wave absorption in the lower ionosphere,
   ionosphere F2 layer low height and defocusing lens formation at the
   heights of 130-150 km. In nighttime conditions of the ionosphere, near the
   level of pump wave (PW) reflection, generation of intensive ionospheric
   artificial inhomogeneities of different scales (from parts of a meter to
   tens of kilometers in the cross direction of geomagnetic field), effecting
   HF-UHF-DF radio wave propagation, is observed. Appearance of artificial
   inhomogeneities with the scales of tens-hundreds of meters is registered
   from E-layer heights to the height of the outer ionosphere. At the heights
   of 250-400 km, focusing lens generation is observed; and at the heights of
   the outer ionosphere, ducts with increased plasma density are registered.
   Gyroharmonic properties of different scale inhomogeneity generation and
   the possibility of super small-scale (decameter) inhomogeneity generation
   in the conditions, when PW frequency is slightly above electron
   gyroharmonic frequency, are discussed. Experimental results, concerning
   moving ionospheric disturbance generation during periodical effect of a
   powerful radio wave on ionospheric plasma, are presented. On the basis of
   the obtained experimental data the conclusion is given, that the
   ionospheric region, where artificial ionospheric inhomogeneities of
   different nature are registered, considerably exceeds the size of the
   ionosphere, illuminated by powerful radio wave beam.