Editing Faraday effect (section)

==== Ionosphere ====
[[Radio wave]]s passing through the Earth's [[ionosphere]] are likewise subject to the Faraday effect. The ionosphere consists of a plasma containing free electrons which contribute to Faraday rotation according to the above equation, whereas the positive ions are relatively massive and have little influence. In conjunction with the Earth's magnetic field, rotation of the polarization of radio waves thus occurs. Since the density of electrons in the ionosphere varies greatly on a daily basis, as well as over the [[sunspot cycle]], the magnitude of the effect varies. However the effect is always proportional to the square of the wavelength, so even at the UHF television frequency of 500&nbsp;MHz (λ = 60&nbsp;cm), there can be more than a complete rotation of the axis of polarization.<ref>Larry Wolfgang, Charles Hutchinson, (ed), ''The ARRL |Handbook for Radio Amateurs, Sixty Eighth Edition '', American Radio Relay League, 1990 {{ISBN|0-87259-168-9}}, pages 23-34, 23-25,</ref>  A consequence is that although most radio transmitting antennas are either vertically or horizontally polarized, the polarization of a medium or short wave signal after [[Skywave|reflection by the ionosphere]] is rather unpredictable. However the Faraday effect due to free electrons diminishes rapidly at higher frequencies (shorter wavelengths) so that at [[microwave]] frequencies, used by [[satellite communications]], the transmitted polarization is maintained between the satellite and the ground.