Spatio-Temporal Energy Cascade in Three-Dimensional Magnetohydrodynamic Turbulence
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| Format: | Preprint |
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2024
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| _version_ | 1866910720892862464 |
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| author | Arrò, Giuseppe Li, Hui Matthaeus, William H. |
| author_facet | Arrò, Giuseppe Li, Hui Matthaeus, William H. |
| contents | We present a new scale decomposition method to investigate turbulence in wavenumber-frequency space. Using 3D magnetohydrodynamic turbulence simulations, we show that magnetic fluctuations with time scales longer than the nonlinear time exhibit an inverse cascade toward even smaller frequencies. Low frequency magnetic fluctuations support turbulence, acting as an energy reservoir that is converted into plasma kinetic energy, the latter cascading toward large wavenumbers and frequencies, where it is dissipated. Our results shed new light on the spatio-temporal properties of turbulence, potentially explaining the origin and role of low frequency turbulent fluctuations in the solar wind. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2411_19927 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Spatio-Temporal Energy Cascade in Three-Dimensional Magnetohydrodynamic Turbulence Arrò, Giuseppe Li, Hui Matthaeus, William H. Solar and Stellar Astrophysics Plasma Physics Space Physics We present a new scale decomposition method to investigate turbulence in wavenumber-frequency space. Using 3D magnetohydrodynamic turbulence simulations, we show that magnetic fluctuations with time scales longer than the nonlinear time exhibit an inverse cascade toward even smaller frequencies. Low frequency magnetic fluctuations support turbulence, acting as an energy reservoir that is converted into plasma kinetic energy, the latter cascading toward large wavenumbers and frequencies, where it is dissipated. Our results shed new light on the spatio-temporal properties of turbulence, potentially explaining the origin and role of low frequency turbulent fluctuations in the solar wind. |
| title | Spatio-Temporal Energy Cascade in Three-Dimensional Magnetohydrodynamic Turbulence |
| topic | Solar and Stellar Astrophysics Plasma Physics Space Physics |
| url | https://arxiv.org/abs/2411.19927 |