"The First Rain" genre: Alternative General
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	Added 01/10/02 Magnetic fields can be determined from the observations of the linear polarization of the radio continuum emission. The non-thermal radio emission, that is dominant at cm-wavelength, originates in the synchrotron emission process, a result of relativistic electrons being braked in magnetic fields when spiralling around the field lines. The emitted E polarization vector is perpendicular to the magnetic field. This linear polarization can suffer Faraday rotation by the passage through the magneto-ionic medium in the observed galaxy or in our own Galaxy. Faraday rotation increases with the square of observation wavelength which can be seen e.g. by comparing the 20cm and 6cm maps of M51. Depolarization can also affect the polarization vectors, especially near areas of rapid change of the polarization angle or of strong Faraday rotation (see M51 at 20cm.)
	Credits: Written and recorded by Western Magnetics

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