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Article Dans Une Revue Physical Review Letters Année : 2022

Enhancement of the Nonresonant Streaming Instability by Particle Collisions

Résumé

Streaming cosmic rays can power the exponential growth of a seed magnetic field by exciting a nonresonant instability that feeds on their bulk kinetic energy. By generating the necessary turbulent magnetic field, it is thought to play a key role in the confinement and acceleration of cosmic rays at shocks. In this Letter we present hybrid-particle-in-cell simulations of the nonresonant mode including Monte Carlo collisions, and investigate the interplay between the pressure anisotropies produced by the instability and particle collisions in the background plasma. Simulations of poorly ionized plasmas confirm the rapid damping of the instability by proton-neutral collisions predicted by linear fluid theory calculations. In contrast we find that Coulomb collisions in fully ionized plasmas do not oppose the growth of the magnetic field, but under certain conditions suppress the pressure anisotropies and actually enhance the magnetic field amplification.
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Dates et versions

hal-03481661 , version 1 (05-03-2024)

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Alexis Marret, Andrea Ciardi, Roch Smets, Julien Fuchs, Loic Nicolas. Enhancement of the Nonresonant Streaming Instability by Particle Collisions. Physical Review Letters, 2022, 128 (11), pp.115101. ⟨10.1103/PhysRevLett.128.115101⟩. ⟨hal-03481661⟩
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