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- W3208045323 abstract "This paper explores small-scale departures from force-free electrodynamics around a rotating neutron star, extending our treatment of resistive instability in a quantizing magnetic field. A secondary, Cerenkov instability is identified: relativistic particles flowing through thin current sheets excite propagating charge perturbations that are localized near the sheets. Growth is rapid at wavenumbers below the inverse ambient skin depth $k_{p,rm ex}$. Small-scale Alfv'enic wavepackets are promising sources of coherent curvature radiation. When the group Lorentz factor $gamma_{rm gr} lesssim (k_{p,rm ex}R_c)^{1/3} sim 100$, where $R_c$ is the magnetic curvature radius, a fraction $sim 10^{-3}$-$10^{-2}$ of the particle kinetic energy is radiated into the extraordinary mode at a peak frequency $sim 10^{-2}ck_{p,rm ex}$. Consistency with observations requires a high pair multiplicity ($sim 10^{3-5}$) in the pulsar magnetosphere. Neither the primary, slow resistive instability nor the secondary, Alfv'enic instability depend directly on the presence of magnetospheric `gaps', and may activate where the mean current is fully supplied by outward drift of the corotation charge. The resistive mode is overstable and grows at a rate comparable to the stellar spin frequency; the model directly accommodates strong pulse-to-pulse radio flux variations and coordinated subpulse drift. Alfv'en mode growth can track the local plasma conditions, allowing for lower-frequency emission from the outer magnetosphere. Beamed radio emission from charged packets with $gamma_{rm gr} sim 50-100$ also varies on sub-millisecond timescales. The modes identified here will be excited inside the magnetosphere of a magnetar, and may mediate Taylor relaxation of the magnetic twist." @default.
- W3208045323 created "2021-11-08" @default.
- W3208045323 creator A5006526357 @default.
- W3208045323 date "2022-07-01" @default.
- W3208045323 modified "2023-10-18" @default.
- W3208045323 title "Radio Emission of Pulsars. II. Coherence Catalyzed by Cerenkov-unstable Shear Alfvén Waves" @default.
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- W3208045323 doi "https://doi.org/10.3847/1538-4357/ac51d4" @default.
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