Faraday rotation


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Faraday rotation

(fa -ră-day) The rotation of the plane of polarization experienced by a beam of plane-polarized radiation when it passes through a region where there are free electrons and a magnetic field. The plane of polarization is rotated through an angle equal to λ2RM, where λ denotes the radiation wavelength. RM is the rotation measure and is proportional to the integral along the line of sight of the product of the electron density, n e, and the component of the magnetic flux density, B , parallel to the line of sight. Faraday rotation can occur in the interstellar medium, within radio sources themselves, or in the Earth's ionosphere. The interstellar magnetic field can be estimated by dividing the rotation measure by the dispersion measure. The synchrotron emission from a radio source may become depolarized by random Faraday rotation within the source.

Faraday rotation

[′far·ə‚dā rō′tā·shən]
(optics)
References in periodicals archive ?
"Gravitational Faraday rotation should leave its fingerprints on such compact regions close to a black hole.
The angular dimensions of junction were slightly modified to obtain [pi]/4 Faraday rotation angle for the length of ferrite section L = 26 mm at operation frequency [f.sub.0] = 8.2 GHz.
Faraday rotation occurs when a linearly polarized light wave travels through a magnetized medium such as the magnetosphere.
Therefore, because Earth's magnetic field is known, researchers can use measurements of Faraday rotation to reconstruct electron density in the magnetosphere.
Due to the similar geometry to the circular waveguide with coaxially located ferrite rod such structure allows to obtain close to optimal Faraday rotation effect.
In Section 3.2 the CFCL junction with Faraday rotation angle [pi]/4 is designed and applied to realize circulator.
7 the parametric studies of ferrite section length [L.sub.opt] ensuring Faraday rotation angle [pi]/4 are presented.
Isolation exceeding 40 dB for a Faraday rotation isolator operating at 35 Ghz has been reported.
Moore, "A 300 GHz Quasi-Optical Faraday Rotation Isolator," Int.
MSWs can diffract a light wave guided in the garnet film, through the magneto-optic Faraday rotation effect.
Faraday rotations at 1.3 [um]m of 2000[degrees]/cm, 10 times higher than in pure YIG, are obtained with 50 percent substitution of bismuth for yttrium.