Abstract: | The dependence of anomalous attenuation of sounding waves on the frequency f is studied experimentally in the case of ionospheric
F-layer modification by high-power radio emission. It is shown that anomalous attenuation increases for |f−f0| < 20 kHz, f<f0 (f0 is the pump-wave frequency) and decreases for f>-f0 compared with the frequencies that are more distant from f0. This phenomenon is caused by plasma displacement and formation of a stepped electron-density profile in the region of upper
hybrid resonance of the pump wave.
Radiophysical Research Institute, Nizhny Novgorod, Russia. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika,
Vol. 41, No. 8, pp. 966–977, August, 1998. |