Simulation study of magnetic fields generated by the electromagnetic filamentation instability

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Magnetohydrodynamics And Plasmas, Gamma-Ray Sources, Gamma-Ray Bursts

Scientific paper

We have investigated the effects of plasma instabilities driven by rapid e+/- pair cascades, which arise in the environment of GRB sources as a result of back-scattering of a seed fraction of the original spectrum. The injection of e+/- pairs induces strong streaming motions in the ambient medium. One therefore expects the pair-enriched medium ahead of the forward shock to be strongly sheared on length scales comparable to the radiation front thickness. Using three-dimensional particle-in-cell simulations, we show that plasma instabilities driven by these streaming e+/- pairs are responsible for the excitation of near-equipartition, turbulent magnetic fields. Our results reveal the importance of the electromagnetic filamentation instability in ensuring an effective coupling between e+/- pairs and ions, and may help explain the origin of large upstream fields in GRB shocks.

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