An Idealized Pulsar Magnetosphere: the Relativistic Force-Free   Approximation
  The non-dissipative relativistic force-free condition should be a good approximation to describe the electromagnetic field in much of the pulsar magnetosphere, but we may plausibly expect it to break down in singular domains. Self-consistent magnetospheric solutions are found with field lines closing both at and within the light-cylinder. In general, the detailed properties of the solutions may be affected critically by the physics determining the appropriate choice of equatorial boundary condition beyond the light-cylinder. 
Simon P.Goodwin (1,2), Jonathan Mestel (3), Leon Mestel (1) & Geoffrey   A.E. Wright (1) (1. Sussex;2. Cardiff;3. Imperial C...