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VOLUME 25 (1977) | ISSUE 5 | PAGE 237
Demodulation of high-power low-frequency waves in the subauroral ionosphere in the range of geometric pulsations
Demodulation of intense signals from a subauroral VLF transmitter, operating at frequencies f0= 17-35 kHz with amplitude modulations at fm =0.5 Hz was observed. From an analysis of the amplitudes (—0.5-5.0 my) of the three magnetic components of the demodulated waves it is concluded that the demodulation is due to excitation of a meridional electric current in the ionosphere as a result of the heating nonlinearity. The demodulation process has a tendency to saturate when the power is increased, and the relaxation time is ~ 30 msec.