Abstract
We demonstrate the transition in the waves generated by the electron-ion hybrid instability from a predominantly electrostatic to a predominantly electromagnetic character in a magnetized cylindrical laboratory plasma, in which we have induced sheared electron flow, transverse to the axial magnetic field and localized to a narrow azimuthal region. The transition occurs when the density of the plasma is increased, so that the electron skin depth is reduced to the same order as the wavelength of the waves. In the electromagnetic mode, we observe prominent bursts in the wave activity exhibiting substantial (up to 30%) frequency chirp, randomly occurring at a rate that is highly sensitive to the electric field structure in the boundary layer.
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