Abstract
THE expansion of the volume in which relativistic particles, magnetic fields and ionized gases are contained must be accompanied by both a decrease of the flux density of the synchrotron radio-emission1 and a change of its polarization parameters. If the radio-emission of such a source is linearly polarized and if the plane of polarization undergoes Faraday rotation φs within the source itself and Faraday rotation φg in the galactic interstellar medium2–4, then with a sufficiently rapid expansion of this source, the rate of change of the positional angle will be 
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SHOLOMITSKY, G. Variation of the Positional Angle of the Polarization Plane of Radiosources with Time. Nature 213, 580 (1967). https://doi.org/10.1038/213580a0
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DOI: https://doi.org/10.1038/213580a0
