A Unified Phenomenology of Ion Heating in Low-$β$ Plasmas: Test-Particle Simulations
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arXiv
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| Auteurs principaux: | , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866909761614643200 |
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| author | Johnston, Zade Squire, Jonathan Meyrand, Romain |
| author_facet | Johnston, Zade Squire, Jonathan Meyrand, Romain |
| contents | We argue that stochastic and resonant ion heating, often viewed as distinct processes in low-$β$ collisionless plasmas, are the far limits of a continuum controlled by nonlinear broadening of turbulent fluctuations, and thus by the normalized cross helicity. We propose a simple empirical formula that captures both regimes, generalizing that commonly used to describe stochastic heating. Simulations of test ions interacting with turbulence confirm our scalings across a wide range of different ion and turbulence properties, including with a steep ion-kinetic transition range as seen in the solar wind. Our results provide a unified framework for understanding ion heating processes across diverse astrophysical environments from black-hole accretion disks to the solar corona, also providing a compact and versatile subgrid model for larger-scale simulations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_07015 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | A Unified Phenomenology of Ion Heating in Low-$β$ Plasmas: Test-Particle Simulations Johnston, Zade Squire, Jonathan Meyrand, Romain Solar and Stellar Astrophysics Plasma Physics Space Physics We argue that stochastic and resonant ion heating, often viewed as distinct processes in low-$β$ collisionless plasmas, are the far limits of a continuum controlled by nonlinear broadening of turbulent fluctuations, and thus by the normalized cross helicity. We propose a simple empirical formula that captures both regimes, generalizing that commonly used to describe stochastic heating. Simulations of test ions interacting with turbulence confirm our scalings across a wide range of different ion and turbulence properties, including with a steep ion-kinetic transition range as seen in the solar wind. Our results provide a unified framework for understanding ion heating processes across diverse astrophysical environments from black-hole accretion disks to the solar corona, also providing a compact and versatile subgrid model for larger-scale simulations. |
| title | A Unified Phenomenology of Ion Heating in Low-$β$ Plasmas: Test-Particle Simulations |
| topic | Solar and Stellar Astrophysics Plasma Physics Space Physics |
| url | https://arxiv.org/abs/2409.07015 |