Instabilities in Relativistic Pair Plasma and the Problem of Pulsar Radio Emission

Physics – Plasma Physics

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Scientific paper

A theory of pulsar radio emission generation, in which the observed observed waves are produced directly by the maser-type plasma instabilities on the anomalous cyclotron-Cherenkov resonance ω- k_allel v_allel + ω_B/ γ_res=0 and the Cherenkov-drift resonance ω- k_allel v_allel - k_⊥ ud =0, is capable of explaining the main observational characteristics of pulsar radio emission. The instabilities are due to the interaction of the fast particles of the primary beam and from the tail of the distribution with the normal modes of a strongly magnetized one-dimensional electron-positron plasma. The waves emitted at these resonances are vacuum-like electromagnetic waves that may leave magnetosphere directly. The cyclotron-Cherenkov instability is responsible for core emission pattern and the Cherenkov-drift instability produces conal emission. The conditions for the development of the cyclotron-Cherenkov instability are satisfied for the both typical and millisecond pulsars provided that the streaming energy of the bulk plasma is not very high γp = 5div 10. In a typical pulsar the cyclotron-Cherenkov and Cherenkov-drift resonances occur in the outer parts of magnetosphere at r_res ≈ 10^9 cm.

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