An experiment is described that was performed in an alkali plasma (Cs) device in order to test the theory of the Farley instability. With υE×B > Cs (the speed of sound) and νι ≳ ωcι(νe ≪ ωce) wave excitation occurs, the waves traveling normal to the magnetic field B at the υE×B speed. The perturbations are strongly elongated along the B field lines, with λ∥ ≫ λ⊥. A comparison with theoretical predictions is given for the observed excitation conditions of the instability.
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D’Angelo et al. (1974) studied this question.
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