Magneto-ionic double refraction
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In telecommunication, magneto-ionic double refraction is the combined effect of the Earth's magnetic field and atmospheric ionization, whereby a linearly polarized wave entering the ionosphere is split into two components called the orinary wave and extra-ordinary wave.
The component waves follow different paths, experience different attenuations, have different phase velocities, and, in general, are elliptically polarized in opposite senses.
[edit] References
This article incorporates public domain material from the General Services Administration document "Federal Standard 1037C".
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