Abstract
Experiments were carried out on the transmission of low-frequency ion waves in the direction of the electron drift along a mercury arc column, with and without an axial magnetic field. The waves were excited by a short exciter coil wound around the column or by modulation of the ionization rate wlth a pair of grids. The wavelength was observed to increase as the frequency was reduced, and below a critical frequency no waves appeared. Comparison of the observed cut-off frequencies and electron temperatures with those calculated with a two-fluid treatment of waves in a plasma show that these ion waves have higher phase velocities than in an infinite medium. (D.L.C.)
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