Journal article
Modeling the Saturation of the Bell Instability Using Hybrid Simulations
The Astrophysical journal, Vol.967(1), p.71
05/01/2024
DOI: 10.3847/1538-4357/ad3960
Abstract
The nonresonant streaming instability (Bell instability) plays a pivotal role in the acceleration and confinement of cosmic rays (CRs), yet the exact mechanism responsible for its saturation and the magnitude of the final amplified magnetic field have not been assessed from first principles. Using a survey of hybrid simulations (with kinetic ions and fluid electrons), we study the evolution of the Bell instability as a function of the parameters of the CR population. We find that at saturation, the magnetic pressure in the amplified field is comparable with the initial CR anisotropic pressure, rather than with the CR energy flux, as previously argued. These results provide a predictive prescription for the total magnetic field amplification expected in the many astrophysical environments where the Bell instability is important.
Details
- Title: Subtitle
- Modeling the Saturation of the Bell Instability Using Hybrid Simulations
- Creators
- Georgios Zacharegkas - University of ChicagoDamiano Caprioli - University of ChicagoColby Haggerty - University of ChicagoSiddhartha Gupta - University of ChicagoBenedikt Schroer - University of Chicago
- Resource Type
- Journal article
- Publication Details
- The Astrophysical journal, Vol.967(1), p.71
- DOI
- 10.3847/1538-4357/ad3960
- ISSN
- 0004-637X
- eISSN
- 1538-4357
- Publisher
- IOP Publishing Ltd
- Number of pages
- 9
- Grant note
- AST-1909778; PHY-2010240; AST-2009326 / NASA; National Aeronautics & Space Administration (NASA) NSF FDSS grant 80NSSC20K1273; 80NSSC23K0099 / National Aeronautics and Space Administration (NASA)https://doi.org/10.13039/100000104 AGS-1936393 / NSF; National Science Foundation (NSF)
- Language
- English
- Date published
- 05/01/2024
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9985224318902771
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