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Transverse electron-scale instability in relativistic shear flows

E. P. Alves, T. Grismayer, R. A. Fonseca, and L. O. Silva
Phys. Rev. E 92, 021101(R) – Published 19 August 2015

Abstract

Electron-scale surface waves are shown to be unstable in the transverse plane of a sheared flow in an initially unmagnetized collisionless plasma, not captured by (magneto)hydrodynamics. It is found that these unstable modes have a higher growth rate than the closely related electron-scale Kelvin-Helmholtz instability in relativistic shears. Multidimensional particle-in-cell simulations verify the analytic results and further reveal the emergence of mushroomlike electron density structures in the nonlinear phase of the instability, similar to those observed in the Rayleigh Taylor instability despite the great disparity in scales and different underlying physics. This transverse electron-scale instability may play an important role in relativistic and supersonic sheared flow scenarios, which are stable at the (magneto)hydrodynamic level. Macroscopic (c/ωpe) fields are shown to be generated by this microscopic shear instability, which are relevant for particle acceleration, radiation emission, and to seed magnetohydrodynamic processes at long time scales.

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  • Received 14 October 2014

DOI:https://doi.org/10.1103/PhysRevE.92.021101

©2015 American Physical Society

Authors & Affiliations

E. P. Alves1,*, T. Grismayer1, R. A. Fonseca1,2, and L. O. Silva1,†

  • 1GoLP/Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisbon, Portugal
  • 2DCTI/ISCTE–Instituto Universitário de Lisboa, 1649-026 Lisbon, Portugal

  • *e.paulo.alves@ist.utl.pt
  • luis.silva@ist.utl.pt

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Vol. 92, Iss. 2 — August 2015

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