Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002a%26a...394..729s&link_type=abstract
Astronomy and Astrophysics, v.394, p.729-734 (2002)
Astronomy and Astrophysics
Astrophysics
1
Stars: Pulsars: General, Polarization, Radiation Mechanisms: Non-Thermal, Plasmas, Instabilities
Scientific paper
We present a plasma model for formation of discontinuous position-angle curves observed in some radio pulsar profiles. The model is based on the polarization properties of radio waves excited by Cherenkov-drift instability developing in pulsar magnetospheres. The radiation is confined in a cone of emission and consists of two orthogonally polarized waves. Examination of a quasi-linear stage of Cherenkov-drift instability shows that the excitation mechanism provides the modes with different spectral energy densities depending on the direction of vec {k}. As a pulsar rotates, an observer's sight-line track crosses different mode-predominated areas on the base of the emission cone. Transition of the sight-line track from one mode-predominated area to another results in the formation of pulsar polarization fluctuations observed in polarization angle distribution displays and average waveforms.
Machabeli George
Melikidze George
Shapakidze David
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