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

Abstract

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.

Authors:
ORCiD logo [1];  [2];  [1]
  1. Univ. of California, Los Angeles, CA (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Univ. of California, Oakland, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1544083
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 872; Journal Issue: 1; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; ISM: magnetic fields; shock waves; waves

Citation Formats

Weidl, Martin S., Winske, Dan, and Niemann, Christoph. On the Background-gyroresonant Character of Bell’s Instability in the Large-current Regime. United States: N. p., 2019. Web. doi:10.3847/1538-4357/aafad0.
Weidl, Martin S., Winske, Dan, & Niemann, Christoph. On the Background-gyroresonant Character of Bell’s Instability in the Large-current Regime. United States. doi:10.3847/1538-4357/aafad0.
Weidl, Martin S., Winske, Dan, and Niemann, Christoph. Fri . "On the Background-gyroresonant Character of Bell’s Instability in the Large-current Regime". United States. doi:10.3847/1538-4357/aafad0. https://www.osti.gov/servlets/purl/1544083.
@article{osti_1544083,
title = {On the Background-gyroresonant Character of Bell’s Instability in the Large-current Regime},
author = {Weidl, Martin S. and Winske, Dan and Niemann, Christoph},
abstractNote = {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.},
doi = {10.3847/1538-4357/aafad0},
journal = {The Astrophysical Journal (Online)},
number = 1,
volume = 872,
place = {United States},
year = {2019},
month = {2}
}

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