The effect of plasma instabilities on the ionospherically reflected wave from a high-power transmitter

Details The effect of plasma instabilities on the ionospherically reflected wave from a high-power transmitter The effect of plasma instabilities on the ionospherically reflected wave from a high-power transmitter

Jul 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.5746f&link_type=abstract

Journal of Geophysical Research, vol. 86, July 1, 1981, p. 5746-5750. Research supported by the Deutsche Forschungsgemeinschaft

Physics

27

Electromagnetic Absorption, Ionospheric Propagation, Magnetohydrodynamic Stability, Radio Echoes, Radio Transmitters, Reflected Waves, Electrostatic Waves, Radio Scattering, Signal Fading, Sky Waves, Transmission Efficiency

Scientific paper

Observations of the reflected radio wave from a high-power transmitter reveal, at times of not too high ionospheric absorption, a drop of signal strength of typically almost 10db in the first few milliseconds after the arrival of the ionospheric echo following the switching on of a transmitter with 130 MW equivalent power. This decline in signal strength is attributed to the excitation of the parametric decay instability. During approximately the next 5 sec, a further drop in signal strength by nearly 10 db is observed. The decrease here is attributed to the excitation of short-scale field-aligned irregularities which scatter the incident radio wave into Langmuir waves. The observations are seen as confirming the theoretical threshold of the parametric decay instability. It is noted that there are also indications that the formation of short-scale field-aligned irregularities inhibits the excitation of the parametric decay instability.

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