... About ATNF overview . ... Parkes | ... Next Section: Elliptically polarized natural modes . ... The propagation effect is then Faraday rotation, which causes the plane of any linear polarization to rotate and which does not alter the degree of circular polarization. In a medium whose natural modes are linearly or elliptically polarized, the counterpart of Faraday rotation, which we refer to as ``generalized Faraday rotation'', can lead to a partial conversion of linear into circular polarization. ...