57 research outputs found
Nature of microstructure in pulsar radio emission
We present a model for microstructure in pulsar radio emission. We propose
that micropulses result from the alteration of the radio wave generation region
by nearly transverse drift waves propagating across the pulsar magnetic field
and encircling the bundle of the open magnetic field lines. It is demonstrated
that such waves can modify significantly curvature of these dipolar field
lines. This in turn affects strongly fulfillment of the resonance conditions
necessary for the excitation of radio waves. The time-scale of micropulses is
therefore determined by the wavelength of drift waves. Main features of the
microstructure are naturally explained in the frame of this model.Comment: 4 pages, submitted to MNRAS Letter
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