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Recently, one of the authors (A. V. G.)developed a theory of low-frequency plasma irregularities which are created as aconsequence of neutral turbulence in the D and lower E regions. In the followingthis theory will be applied to coherent backscatter experiments with radars in afrequency range between 5 and 150 MHz. We discuss the dependence of thebackscatter cross-section on ionospheric as well as on turbulence parameters.The backscatter increases strongly with decreasing radar frequency. Above 15 MHzthe effects discussed here can probably only be detected by very powerful radarswith large antenna arrays

Radar backscatter from plasma irregularities of the lower E region induced by neutral turbulence