Pulsar Radio Emission by Conversion of Plasma Wave Turbulence: Nanosecond Time Structure | Zendy

James C. Weatherall | Zendy

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Pulsar Radio Emission by Conversion of Plasma Wave Turbulence: Nanosecond Time Structure

Author(s) -

James C. Weatherall

Publication year - 1998

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/306218

Subject(s) - physics , turbulence , plasma , astrophysics , langmuir turbulence , radiative transfer , electric field , pulsar , wave turbulence , computational physics , pulse (music) , electromagnetic radiation , atomic physics , optics , plasma oscillation , mechanics , quantum mechanics , detector

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 subnanosecond to 10 ns timescales. The pulse exhibits an unusual spectral signature because of the coupling of the electromagnetic modes to the underlying electrostatic pump wave. This prediction can be tested with ultrashort timescale observations.

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