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VOLUME 20 | ISSUE 4 | PAGE 101
Combination frequencies in the interaction between high-power short-wave radiation and ionospheric plasma
Emission due to quadratic nonlinearity in the ionosphere was observed at the modulation frequency of a high-power short-wave transmitter. The transmitter delivered an average power of 130 kW at 5.75 MHz to an antenna with a vertical directivity pattern. The antenna gain was G=;150. A signal with field intensity Ε —0.02 μν/m was registered in daytime at transmitter modulation frequencies from 1.2 to 7 kHz at a distance 180 km. It is shown that the principal role in the formation of the combination-frequency signals is played by the heating nonlinearity in the ionosphere D layer.

Permission given by American Institute of Physics is appreciated.