a1 Department of Applied Mathematics, University College of North Wales, Bangor, Caornarvonshire, Wales
This paper presents an analysis of the linear dispersion relation for electrostatic waves in a Vlasov plasma of unmagnetized, Maxwellian ions and magnetized, Maxwellian electrons. The electrons undergo E × B and B drifts, and the electron β is small. For propagation in the perpendicular direction, maximum growth rates can be substantially larger than those of the zero magnetic field ion acoustic instability. For propagation outside a few degrees from the perpendicular the dispersion characteristics are essentially those of the ion acoustic instability.
(Received April 20 1970)
p1 Present address: Physics Dept., C. of William and Mary, Williamsburg, Va., U.S.A.
* Loverhulmo Visiting Follow, 1969–70.