Anomalous attenuation of extraordinary waves in ionosphere heating   experiments
  The results of experimental and theoretical study of anomalous attenuation of probe extraordinary waves in experiments on modification of ionosphere by powerful HF waves on "Sura" heating facility are presented. The experimental data indicate significant attenuation of extraordinary waves which can be explained as a result of multiple scattering of extraordinary waves on small-scale random irregularities. The possibility of diagnostics of spectrum of artificial irregularities from measurements of anomalous attenuation of extraordinary waves is demonstrated. 
N.A. Zabotin, H.A. Mityakov, G.P. Komrakov, V.L. Frolov, E.N. Sergeev,   A.G. Bronin, G.A. Zhbankov