  We have explored the magnetosphere described by a numerical solution for an
axisymmetric rotating field satisfying the force-free and ideal MHD conditions
everywhere. The electric current distribution is determined by the requirement
of continuity and smoothness of the flux function across the light cylinder.
The overall magnetic field structure is obtained using the numerical result. We
also checked the drift velocity of a charged particle, which is caused by the
resultant electric and magnetic fields. It is found that the velocity exceeds
the light speed beyond a few times the size of the light cylinder. This fact
suggests the breakdown of some underlying assumptions.
