Avalanches in Magnetohydrodynamical simulations
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arXiv
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| Format: | Preprint |
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2025
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| author | Lamarre, Henri Charbonneau, Paul Noraz, Quentin Strugarek, Antoine Blaise, Alexis Brun, Allan Sacha Carlsson, Mats Gudiksen, Boris Vilhelm |
| author_facet | Lamarre, Henri Charbonneau, Paul Noraz, Quentin Strugarek, Antoine Blaise, Alexis Brun, Allan Sacha Carlsson, Mats Gudiksen, Boris Vilhelm |
| contents | Scale invariance is a hallmark of many natural systems, including solar flares, where energy release spans a vast range of scales. Recent computational advances, at the level of both algorithmics and hardware, have enabled high-resolution magnetohydrodynamical (MHD) simulations to span multiple scales, offering new insights into magnetic energy dissipation processes. Here, we study scale invariance of magnetic energy dissipation in two distinct MHD simulations. Current sheets are identified and analyzed over time. Results demonstrate that dissipative events exhibit scale invariance, with power-law distributions characterizing their energy dissipation and lifetimes. Remarkably, these distributions are consistent across the two simulations, despite differing numerical and physical setups, suggesting universality in the process of magnetic energy dissipation. Comparisons between the evolution of dissipation regions reveals distinct growth behaviors in high plasma-beta regions (convective zone) and low plasma-beta regions (atmosphere). The latter display spatiotemporal dynamics similar to those of avalanche models, suggesting self-organized criticality and a common universality class. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_25066 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Avalanches in Magnetohydrodynamical simulations Lamarre, Henri Charbonneau, Paul Noraz, Quentin Strugarek, Antoine Blaise, Alexis Brun, Allan Sacha Carlsson, Mats Gudiksen, Boris Vilhelm Solar and Stellar Astrophysics Plasma Physics Scale invariance is a hallmark of many natural systems, including solar flares, where energy release spans a vast range of scales. Recent computational advances, at the level of both algorithmics and hardware, have enabled high-resolution magnetohydrodynamical (MHD) simulations to span multiple scales, offering new insights into magnetic energy dissipation processes. Here, we study scale invariance of magnetic energy dissipation in two distinct MHD simulations. Current sheets are identified and analyzed over time. Results demonstrate that dissipative events exhibit scale invariance, with power-law distributions characterizing their energy dissipation and lifetimes. Remarkably, these distributions are consistent across the two simulations, despite differing numerical and physical setups, suggesting universality in the process of magnetic energy dissipation. Comparisons between the evolution of dissipation regions reveals distinct growth behaviors in high plasma-beta regions (convective zone) and low plasma-beta regions (atmosphere). The latter display spatiotemporal dynamics similar to those of avalanche models, suggesting self-organized criticality and a common universality class. |
| title | Avalanches in Magnetohydrodynamical simulations |
| topic | Solar and Stellar Astrophysics Plasma Physics |
| url | https://arxiv.org/abs/2509.25066 |