A Two-dimensional Numerical Study of Ion-Acoustic Turbulence
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arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2023
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| _version_ | 1866910516886110208 |
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| author | Liu, Zhuo White, Ryan Milanese, Lucio M. Loureiro, Nuno F. |
| author_facet | Liu, Zhuo White, Ryan Milanese, Lucio M. Loureiro, Nuno F. |
| contents | We investigate the linear and nonlinear evolution of the ion-acoustic instability in a collisionless plasma via two-dimensional (2D2V) Vlasov-Poisson numerical simulations. We initialize the system in a stable state and gradually drive it towards instability with an imposed, weak external electric field, thus avoiding super-critical initial conditions that are physically unrealizable. The nonlinear evolution of ion-acoustic turbulence (IAT) is characterized in detail, including the particles' distribution functions, particle heating, (two-dimensional) wave spectrum, and the resulting anomalous resistivity. An important result is that no steady saturated nonlinear state is ever reached in our simulations: strong ion heating suppresses the instability, which implies that the anomalous resistivity associated with IAT is transient and short-lived. Electron-acoustic waves (EAWs) are triggered during the late nonlinear evolution of the system, caused by strong modifications to the particle distribution induced by IAT. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2309_05563 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | A Two-dimensional Numerical Study of Ion-Acoustic Turbulence Liu, Zhuo White, Ryan Milanese, Lucio M. Loureiro, Nuno F. Plasma Physics Earth and Planetary Astrophysics Solar and Stellar Astrophysics Space Physics We investigate the linear and nonlinear evolution of the ion-acoustic instability in a collisionless plasma via two-dimensional (2D2V) Vlasov-Poisson numerical simulations. We initialize the system in a stable state and gradually drive it towards instability with an imposed, weak external electric field, thus avoiding super-critical initial conditions that are physically unrealizable. The nonlinear evolution of ion-acoustic turbulence (IAT) is characterized in detail, including the particles' distribution functions, particle heating, (two-dimensional) wave spectrum, and the resulting anomalous resistivity. An important result is that no steady saturated nonlinear state is ever reached in our simulations: strong ion heating suppresses the instability, which implies that the anomalous resistivity associated with IAT is transient and short-lived. Electron-acoustic waves (EAWs) are triggered during the late nonlinear evolution of the system, caused by strong modifications to the particle distribution induced by IAT. |
| title | A Two-dimensional Numerical Study of Ion-Acoustic Turbulence |
| topic | Plasma Physics Earth and Planetary Astrophysics Solar and Stellar Astrophysics Space Physics |
| url | https://arxiv.org/abs/2309.05563 |