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Asymmetric spectral broadening of modulated electrostatic ion‐cyclotron waves
Author(s) -
Koepke M. E.,
Alport M. J.,
Sheridan T. E.,
Amatucci W. E.,
Carroll J. J.
Publication year - 1994
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/94gl00175
Subject(s) - cyclotron , physics , amplitude , modulation (music) , ion , atomic physics , computational physics , ionosphere , electrojet , frequency modulation , amplitude modulation , optics , radio frequency , geophysics , quantum mechanics , telecommunications , magnetic field , acoustics , earth's magnetic field , computer science
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.