Conference proceeding
Hybrid Simulations of the Resonant and Non-Resonant Cosmic Ray Streaming Instability
Pos : proceedings of science, Vol.358, 279
07/02/2021
DOI: 10.22323/1.358.0279
Abstract
Using hybrid simulations (kinetic ions--fluid electrons), we test the linear theory predictions of the cosmic ray (CR) streaming instability. We consider two types of CR distribution functions: a ``hot'' distribution where CRs are represented by a drifting power law in momentum and an anisotropic ``beam'' of monochromatic particles .
Additionally, for each CR distribution we scan over different CR densities to transition from triggering the resonant to the non-resonant (Bell) streaming instability.
We determine the growth rates of these instabilities in simulations by fitting an exponential curve during the linear stage, and we show that they agree well with the theoretical predictions as a function of wave number agree.
We also examine the magnetic helicity as a function of time and wave number, finding a general good agreement with the predictions, as well as some unexpected non-linear features to the instability development.
Details
- Title: Subtitle
- Hybrid Simulations of the Resonant and Non-Resonant Cosmic Ray Streaming Instability
- Creators
- Colby Haggerty - University of ChicagoDamiano Caprioli - University of ChicagoEllen Zweibel - University of Wisconsin–Madison
- Resource Type
- Conference proceeding
- Publication Details
- Pos : proceedings of science, Vol.358, 279
- DOI
- 10.22323/1.358.0279
- ISSN
- 1824-8039
- eISSN
- 1824-8039
- Language
- English
- Date published
- 07/02/2021
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9985224318602771
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