Abstract Polarization evolution of radio waves in the plasma of pulsar magnetosphere is considered. The polarization state of the natural waves linearly polarized in orthogonal directions is found to change considerably because of the wave mode coupling and the cyclotron aborption. It is shown that the original natural waves acquire elliptical polarization and become slightly non-orthogonal. A model of the individual pulse polarization is suggested based on an idea of fluctuations in the plasma flow. The implications of the individual pulse polarization data for diagnostics of pulsar plasma are outlined as well.
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