Asymmetric spectral broadening of modulated electrostatic ion-cyclotron waves

Details Asymmetric spectral broadening of modulated electrostatic ion-cyclotron waves Asymmetric spectral broadening of modulated electrostatic ion-cyclotron waves

Jun 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21.1011k&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 11, p. 1011-1014

Physics

15

Amplitude Modulation, Earth Ionosphere, Electrostatic Waves, Emission Spectra, Frequency Modulation, Ion Cyclotron Radiation, Spectral Bands, Asymmetry, Plasmas (Physics), Predictions, Spectrum Analysis

Scientific paper

Modulated, current-driven, electrostatic ion-cyclotron (CDEIC) waves are shown to exhibit amplitude and frequency modulation, spectral broadening, and time-averaged frequency pulling. The observed spectral broadening is asymmetric and sensitively dependent on the driving frequency. Qualitative features of the experimental data are reproduced by the forced van der Pol equation and are explainable using processes associated with driven self oscillations. These results may be relevant to ionospheric modification experiments involving the controlled modulation of the natural electrojet.

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