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A filamentation instability for streaming cosmic-rays

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arxiv 1109.5690 v1 pith:ZOAX5TSZ submitted 2011-09-26 astro-ph.HE

A filamentation instability for streaming cosmic-rays

classification astro-ph.HE
keywords cosmicfilamentationrayscosmic-rayinstabilitymagneticremnantscales
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We demonstrate that cosmic rays form filamentary structures in the precursors of supernova remnant shocks due to their self-generated magnetic fields. The cosmic-ray filamentation results in the growth of a long wavelength instability, and naturally couples the rapid non-linear amplification on small scales to larger length scales. Hybrid magnetohydrodynamics--particle simulations are performed to confirm the effect. The resulting large scale magnetic field may facilitate the scattering of high energy cosmic rays as required to accelerate protons beyond the knee in the cosmic-ray spectrum at supernova remnant shocks. Filamentation far upstream of the shock may also assist in the escape of cosmic rays from the accelerator.

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Cited by 1 Pith paper

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  1. Deep Learning Analysis of Ions Accelerated at Shocks

    astro-ph.HE 2025-11 conditional novelty 6.0

    A convolutional neural network can predict with >90% accuracy whether an ion at a collisionless shock is injected into acceleration, using only the local magnetic field time series from its first few gyrations.