  The phenomenon of profile mode switching in pulsars, where the stable average
pulse profile changes to another stable state on the timescale of a pulsar's
period, remains poorly understood. We sought to understand how pulsars undergo
profile mode switching through a comparative analysis of the polarization and
geometry of the two different profile modes of PSR B0329+54. The polarization
behavior and fitted parameters of the rotation-vector model remain constant
between modes, and the emission height remains constant as well. These
similarities lend support to a model of pair production in the surface plasma
that would cause a change in the available electrons and therefore the
differential emission intensity.
