  In this paper, we consider the Cauchy problem to the planar non-resistive
magnetohydrodynamic equations without heat conductivity, and establish the
global well-posedness of strong solutions with large initial data. The key
ingredient of the proof is to establish the a priori estimates on the effective
viscous flux and a newly introduced "transverse effective viscous flux" vector
field inducted by the transverse magnetic field. The initial density is assumed
only to be uniformly bounded and of finite mass and, in particular, the vacuum
and discontinuities of the density are allowed.
