Investigation of Joint Effect of Two Mechanisms of Probe Wave Anomalous   Attenuation
  Two mechanisms of anomalous attenuation of probe waves in the experiments of ionosphere modification are discussed in the paper. The first mechanism is the well-known conversion of ordinary wave into plasma waves due to scattering from random irregularities in the upper-hybrid resonance region. The second mechanism is the multiple scattering. This mechanism is responsible for anomalous attenuation of extraordinary wave have been observed in several experiments. Investigation of joint effect of both mechanisms gives additional possibilities for diagnostics of artificial irregularities. 
N.A. Zabotin, A.G. Bronin, G.A. Zhbankov, G.P. Komrakov, S.M. Grach