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Creation of electron-positron pairs near the pulsar surface and theparameters of plasma in pulsar magnetospheres are discussed. It is argued thatthe pair creation process is nonstationary, and the pair plasma that flows outfrom the pulsar environment is strongly nonhomogeneous and gathers intoseparate clouds. Plasma instabilities in the outflowing plasma are reviewed.The two-stream instability that develops due to strong nonhomogeneity of theoutflowing plasma is the most plausible reason for the generation of coherentradio emission of pulsars. The development of the two-stream instability inpulsar magnetospheres is considered.

On two-stream instability in pulsar magnetospheres