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Linear Transformation and the Escape of Waves from Pulsar Magnetospheres

Two-stream instability in pulsar magnetospheres generates longitudinal waves, which fall in the superluminal part of the dispersion curve due to stimulated scattering. A superluminal longitudinal wave prop- agating in a curved magnetic field turns into an electromagnetic wave and may escape from plasma in the form of an ordinary transverse wave. However, this wave may go to the subluminal part of the dispersion curve, where it ultimately decays through Landau damping, due to linear transformation. Linear transformation of waves in an ultrarelativistic electron-positron plasma embedded in a superstrong magnetic field is considered. The transformation is shown to occur only in the case of propagation at very small angles to the magnetic field; this process cannot hinder the escape of waves from pulsar magnetospheres.