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Origin of Pulsar Radio Emission

Author(s): Philippov, A; Timokhin, A; Spitkovsky, Anatoly

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Abstract: Since pulsars were discovered as emitters of bright coherent radio emission more than half a century ago, the cause of the emission has remained a mystery. In this Letter we demonstrate that coherent radiation can be directly generated in nonstationary pair plasma discharges which are responsible for filling the pulsar magnetosphere with plasma. By means of large-scale two-dimensional kinetic plasma simulations, we show that if pair creation is nonuniform across magnetic field lines, the screening of electric field by freshly produced pair plasma is accompanied by the emission of waves which arc electromagnetic in nature. Using localized simulations of the screening process, we identify these waves as superluminal ordinary (O) modes, which should freely escape from the magnetosphere as the plasma density drops along the wave path. The spectrum of the waves is broadband and the frequency range is comparable to that of observed pulsar radio emission.
Publication Date: 15-Jun-2020
Electronic Publication Date: 19-Jun-2020
Citation: Philippov, A, Timokhin, A, Spitkovsky, A. (2020). Origin of Pulsar Radio Emission. PHYSICAL REVIEW LETTERS, 124 (24), 10.1103/PhysRevLett.124.245101
DOI: doi:10.1103/PhysRevLett.124.245101
ISSN: 0031-9007
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Type of Material: Journal Article
Journal/Proceeding Title: PHYSICAL REVIEW LETTERS
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.

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