Propagation effects on the polarization of pulsar radio emission

Physics

Scientific paper

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Circular Polarization, Plasma Waves, Pulsar Magnetospheres, Pulsars, Radio Emission, Relativistic Plasmas, Stellar Radiation, Wave Propagation, Cold Plasmas, Faraday Effect, Plasma Radiation, Rarefied Plasmas, Stellar Atmospheres

Scientific paper

Properties of the natural wave modes of a pulsar magnetosphere are investigated in a simple way by adopting the 'low-density limit'. Natural-mode properties in this limit are derived for any particle distribution, and the same wave properties are determined explicitly for a cold-plasma model that includes relativistic streaming motions. 'Faraday rotation' of natural-mode components is examined, along with the mechanism responsible for partially circularly polarized emission. The mode separation is estimated which is required by the interpretation of the 'orthogonal modes' of polarization observed in many pulsars in terms of separation into two natural modes. It is suggested that any systematic variation in the observed occurrence of 'orthogonal modes' with frequency should correlate with the pulse separation in double-pulsed pulsars.

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