When a cloud of charged particles is imbedded in a magnetic field the media exhibits birefringence. This consists of differing indices of refraction for different polarization angles and/or rotations. Any signal passing through this media will undergo Faraday rotation.
In addition, chromatic time dispersion occurs where different frequencies propagate at differing velocities, all less than the speed of light in a vacuum. By observing the combination of birefringence and time dispersion electron density and magnetic field intensity may be independently inferred. A strong correlation between Faraday rotation and redshift of quasars has been observed even with quasars that show proper motion. Has the significance of this been examined?

Charles Ivie - 16.06.12

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