Abstract
The electrostatic instabilities driven by a current perpendicular to an external magnetic field are studied for a homogeneous Vlasov plasma of cold electrons and hot ions. The ions are assumed magnetized. This assumption is allowed for a E × B rotating plasma in which the cross-field current flows for a much longer time than the ion cyclotron period. A new instability of reactive type is found to occur by the coupling of an electron acoustic mode and a Doppler-shifted ion cyclotron mode (in the electron frame).
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