An electromagnetic electron wave is a wave in a plasma which has a magnetic field component and in which primarily the electrons oscillate.
In an unmagnetized plasma, an electromagnetic electron wave is simply a light wave modified by the plasma. In a magnetized plasma, there are two modes perpendicular to the field, the O and X modes, and two modes parallel to the field, the R and L waves.
Read more about Electromagnetic Electron Wave: Cut-off Frequency and Critical Density, O Wave, X Wave, R Wave and L Wave, Dispersion Relations
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