Abstract
The theory of parametric excitation of plasma waves is applied to a plasma in which there is a static drift between electrons and ions. For appropriate values of drift speed and elevated electron-ion temperature ratio, there exists a solution of the dispersion relation and a threshold for instability at a frequency which is close to zero in the electron frame. This instability occurs for pump frequencies which are slightly below the Bohm-Gross frequency. It has some similarities to the oscillating two-stream instability in a plasma in which there is no static drift. An approximate analytic solution of the dispersion relation in the neighborhood of zero frequency is obtained.
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