It has been shown that an Alfv¿n wave can create an electric field along the magnetic field line due to mirror effect. In a converging magnetic field, mobility of electrons is restricted by the mirror force and a parallel electric field must exist to carry a field aligned current associated with Alfv¿n waves. The parallel electric field created by this mechanism can be much larger than that of a kinetic or inertial Alfv¿n wave when the wave frequency is low enough. The essential mechanism of parallel electric field generation is reduced to the static mirror model in the limit where the wave frequency vanishes. ¿ 2000 American Geophysical Union