Pulsar Radio Emission by Conversion of Plasma Wave Turbulence:
Nanosecond Time Structure
J. C. Weatherall
The plasma wave turbulence emission mechanism is studied to make
predictions for the temporal characteristics of pulsar radio
emission. The turbulent emission process consists of a cycle of
electrostatic wave growth and modulational conversion into radiative
modes. The onset of plasma wave turbulence is marked by explosive
spatial collapse of regions of high electric field and bursts of
radiation. Intrinsic time structure is found on sub-nanosecond to ten
nanosecond timescales. The pulse exhibits an unusual spectral
signature due to the coupling of the electromagnetic modes to the
underlying electrostatic pump wave. This prediction can be tested
with ultra-short timescale observations.
STATUS: to appear in Ap.J.
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