Influence of vacuum polarization by a magnetic field on the propagation of electromagnetic waves in plasmas

Physics

Scientific paper

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Magnetic Fields, Plasma-Electromagnetic Interaction, Polarized Electromagnetic Radiation, Vacuum Effects, Wave Propagation, Critical Frequencies, Electromagnetic Absorption, Optical Thickness, Pulsars, Refractivity

Scientific paper

The effect of polarization of an electron-positron vacuum by a magnetic field on the absorption and refraction coefficients and the polarization of normal waves in a magnetoactive plasma is examined. It is shown that plasma concentration has a pronounced effect on the polarization, spectrum, and directivity diagram of the plasma radiation, and that, depending on the frequency, vacuum effects can change linear polarization to circular polarization, and vice versa. At near critical frequencies, the radiation pattern of an optically thick plasma becomes very narrow in a plane normal to the magnetic field, and side lobes may appear.

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