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:
-
- Univ. of California, Los Angeles, CA (United States)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Lab. (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. https://doi.org/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. https://doi.org/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 = {Fri Feb 08 00:00:00 EST 2019},
month = {Fri Feb 08 00:00:00 EST 2019}
}
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Works referencing / citing this record:
Three Regimes and Four Modes for the Resonant Saturation of Parallel Ion-beam Instabilities
journal, March 2019
- Weidl, Martin S.; Winske, Dan; Niemann, Christoph
- The Astrophysical Journal, Vol. 873, Issue 1
On the Growth and Saturation of the Gyroresonant Streaming Instabilities
journal, August 2019
- Holcomb, Cole; Spitkovsky, Anatoly
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dHybridR : A Hybrid Particle-in-cell Code Including Relativistic Ion Dynamics
journal, December 2019
- Haggerty, Colby C.; Caprioli, Damiano
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Laboratory Observations of Ultra-low-frequency Analog Waves Driven by the Right-hand Resonant Ion Beam Instability
journal, February 2020
- Heuer, Peter V.; Weidl, Martin. S.; Dorst, Robert S.
- The Astrophysical Journal, Vol. 891, Issue 1
On the Growth and Saturation of the Gyroresonant Streaming Instabilities
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dHybridR: a Hybrid--Particle-in-Cell Code Including Relativistic Ion Dynamics
text, January 2019
- Haggerty, Colby C.; Caprioli, Damiano
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