Physics
Scientific paper
Aug 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981ge%26ae..21..602a&link_type=abstract
Geomagnetizm i Aeronomiia, vol. 21, July-Aug. 1981, p. 602-606. In Russian.
Physics
Ionospheric Propagation, Magnetohydrodynamic Stability, Plasma-Electromagnetic Interaction, Short Wave Radio Transmission, Brillouin Effect, Ion Acoustic Waves, Raman Spectra, Thresholds
Scientific paper
The parametric instability of ionospheric plasma in a field of intense radio waves in the meter range is discussed. In particular, the decay of high-frequency radio waves into Langmuir and transverse electromagnetic (i.e., stimulated Raman scattering) and into ion-acoustic and electromagnetic waves (i.e., stimulated Brillouin scattering) is considered. A calculation of the threshold fields and increments of perturbation growth number is presented for the case of waves emitted by ground-based transmitters. It is shown that when the amplitude of the transverse wave is not less than 20 V/m, more than half the energy of the original impulse is transferred to the scattered wave. The spectrum of signal scattering shows a red shift (relative to the frequency of the original signal) to frequencies of excited ion-acoustic waves. The form of the spectrum corresponds to those obtained in laboratory experiments.
Abyzov Alexander S.
Bakai A. S.
Solodovnikov G. K.
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