ANOMALOUS ABSORPTION OF POWERFUL RADIO-WAVES ON THE STRIATIONS DEVELOPED DURING IONOSPHERIC MODIFICATION

A nonlinear theory of anomalous absorption of powerful radio waves on small scale irregularities in the ionosphere is constructed. Peculiari ties of the absorption near the third electron gyrofrequency are inves tigated and discussed. The theory is shown to be in agreement with obs ervations. The existence of a maximum in the probe wave absorption is predicted. Its dependence on the shift between the probe wave frequenc y and the pump wave frequency is determined.