Ion acoustic turbulence generated by an ion beam in an unmagnetized plasma is investigated by using electrostatic probes. Digital computed space-time corelation functions, power density spectra and phase spectra are presented. A linear relationship between frequency ω and wave-number k is obtained from the digital computed cross-power density spectra. The spatial evolution of the turbulence and the beam along the direction of the beam is also discussed.
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H. Johnsen (1986) studied this question.
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