## Nonlocal effects on the convective properties of the electrostatic current-driven ion-cyclotron instability

Nonlocal effects due to magnetic shear and finite current channel width on the convective characteristics of the current-driven ion-cyclotron instability have been investigated. When the magnetic shear length (L/sub s/) is smaller than the current channel width (L/sub c/), the group velocity parallel to the external magnetic field at the origin (V/sub g/z) vanishes, and there is a reduction in the group velocity perpendicular to the external magnetic field (V/sub g/y). For L/sub c/approx.10/sup -2/ L/sub s/ the values of V/sub g/z and V/sub g/y as given by local theory are recovered. When L/sub c/< or approx. =rho/sub i/, wheremore »