Abstract
Electrostatic oscillations in a plasma due to magnetic field aligned currents and transverse inhomogeneous d.c. electric fields are examined. It is found that the transverse d.c. electric field and the field aligned current can together play a synergistic role to enable the excitation of broadband electrostatic wves even when the threshold values of the field aligned drift and the E × B drift are individually subcritical. The solution of the dispersion relation indicates that the wave characteristics are dependent on the ratio of the Doppler shifts due to the E × B drift and the field aligned drift, R = k y V E / k z V d .
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