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Published online by Cambridge University Press: 14 August 2015
We argue that the aligned rotator model originally introduced by Goldreich and Julian possesses “static” solutions wherein particles of both sign are trapped within the magnetosphere. Simple models of such distributions are given. For such models to have dynamic properties (constant particle emission, relativistic stellar wind, etc.) one must suppose that the equatorial particles are transported away by (e.g.) flux tube interchange, rather than by flow along field lines as originally proposed.