Electron Influence on the Parallel Proton Firehose Instability in 10-Moment, Multi-Fluid Simulations
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arXiv
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| Autores principales: | , , , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| _version_ | 1866913463001939968 |
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| author | Walters, Jada Klein, Kristopher G. Lichko, Emily Juno, James TenBarge, Jason M. |
| author_facet | Walters, Jada Klein, Kristopher G. Lichko, Emily Juno, James TenBarge, Jason M. |
| contents | Instabilities driven by pressure anisotropy play a critical role in modulating the energy transfer in space and astrophysical plasmas. For the first time, we simulate the evolution and saturation of the parallel proton firehose instability using a multi-fluid model without adding artificial viscosity. These simulations are performed using a 10-moment, multi-fluid model with local and gradient relaxation heat-flux closures in high-$β$ proton-electron plasmas. When these higher-order moments are included and pressure anisotropy is permitted to develop in all species, we find that the electrons have a significant impact on the saturation of the parallel proton firehose instability, modulating the proton pressure anisotropy as the instability saturates. Even for lower $β$s more relevant to heliospheric plasmas, we observe a pronounced electron energization in simulations using the gradient relaxation closure. Our results indicate that resolving the electron pressure anisotropy is important to correctly describe the behavior of multi-species plasma systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_04788 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Electron Influence on the Parallel Proton Firehose Instability in 10-Moment, Multi-Fluid Simulations Walters, Jada Klein, Kristopher G. Lichko, Emily Juno, James TenBarge, Jason M. Solar and Stellar Astrophysics Plasma Physics Instabilities driven by pressure anisotropy play a critical role in modulating the energy transfer in space and astrophysical plasmas. For the first time, we simulate the evolution and saturation of the parallel proton firehose instability using a multi-fluid model without adding artificial viscosity. These simulations are performed using a 10-moment, multi-fluid model with local and gradient relaxation heat-flux closures in high-$β$ proton-electron plasmas. When these higher-order moments are included and pressure anisotropy is permitted to develop in all species, we find that the electrons have a significant impact on the saturation of the parallel proton firehose instability, modulating the proton pressure anisotropy as the instability saturates. Even for lower $β$s more relevant to heliospheric plasmas, we observe a pronounced electron energization in simulations using the gradient relaxation closure. Our results indicate that resolving the electron pressure anisotropy is important to correctly describe the behavior of multi-species plasma systems. |
| title | Electron Influence on the Parallel Proton Firehose Instability in 10-Moment, Multi-Fluid Simulations |
| topic | Solar and Stellar Astrophysics Plasma Physics |
| url | https://arxiv.org/abs/2408.04788 |