On the Background-gyroresonant Character of Bell’s Instability in the Large-current Regime

Weidl, Martin S.; Winske, Dan; Niemann, Christoph

doi:10.3847/1538-4357/aafad0

On the Background-gyroresonant Character of Bell’s Instability in the Large-current Regime

Journal Article · Fri Feb 08 00:00:00 EST 2019 · The Astrophysical Journal (Online)

DOI:https://doi.org/10.3847/1538-4357/aafad0· OSTI ID:1544083

^[1]; Winske, Dan ^[2]; Niemann, Christoph ^[1]

Univ. of California, Los Angeles, CA (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

We demonstrate that the Bell instability, which is widely considered potentially significant for cosmic-ray (CR) acceleration, is the low-frequency limit of a gyroresonant interaction between the protons of the interstellar medium and shear-Alfvén waves. At large CR current densities, its growth rate is therefore limited by the proton gyrofrequency, and two modes emerge from the cold-beam dispersion relation. A third mode driven by electron gyroresonance is only weakly unstable at low current densities. We report on implications for magnetic field amplification and its saturation in the vicinity of supernova remnants.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Univ. of California, Oakland, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1544083

Journal Information:: The Astrophysical Journal (Online), Journal Name: The Astrophysical Journal (Online) Journal Issue: 1 Vol. 872; ISSN 1538-4357

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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dHybridR : A Hybrid Particle-in-cell Code Including Relativistic Ion Dynamics Haggerty, Colby C.; Caprioli, Damiano The Astrophysical Journal, Vol. 887, Issue 2 https://doi.org/10.3847/1538-4357/ab58c8	journal	December 2019
Laboratory Observations of Ultra-low-frequency Analog Waves Driven by the Right-hand Resonant Ion Beam Instability Heuer, Peter V.; Weidl, Martin. S.; Dorst, Robert S. The Astrophysical Journal, Vol. 891, Issue 1 https://doi.org/10.3847/2041-8213/ab75f4	journal	February 2020
On the Growth and Saturation of the Gyroresonant Streaming Instabilities Holcomb, Cole; Spitkovsky, Anatoly arXiv https://doi.org/10.48550/arxiv.1811.01951	text	January 2018
dHybridR: a Hybrid--Particle-in-Cell Code Including Relativistic Ion Dynamics Haggerty, Colby C.; Caprioli, Damiano arXiv https://doi.org/10.48550/arxiv.1909.05255	text	January 2019

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