Abstract
The behavior of a small test wave launched simultaneoualy with a large- amplitude electron plasma wave is calculated by treating the test wave as a slow modulation of the larger wave's amplitude and phase. Test-wave experiments show agreement with the calculation when the test-wave frequency is between the large wave's frequency ( omega₀) and omega₀-4 pi /T, where T is the maim wave's transit time through the experiment. When the spontaneously unstable lower sideband frequency is within this range, the sideband's slow amplitude oscillations agree with the calculation. (auth)
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