Electron-only reconnection and inverse magnetic-energy transfer at sub-ion scales
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866913726155718656 |
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| author | Liu, Zhuo Silva, Caio Milanese, Lucio M. Zhou, Muni Mandell, Noah R. Loureiro, Nuno F. |
| author_facet | Liu, Zhuo Silva, Caio Milanese, Lucio M. Zhou, Muni Mandell, Noah R. Loureiro, Nuno F. |
| contents | We derive, and validate numerically, an analytical model for electron-only magnetic reconnection applicable to strongly magnetized plasmas. Our model predicts sub-ion-scale reconnection rates significantly higher than those pertaining to large-scale reconnection, aligning with recent observations and simulations. We apply this reconnection model to the problem of inverse magnetic energy transfer at sub-ion scales. We derive time-dependent scaling laws for the magnetic energy decay and the typical magnetic structure dimensions that differ from those previously found in the MHD regime. These scaling laws are validated via two- and three-dimensional simulations, demonstrating that sub-ion scale magnetic fields can reach large, system-size scales via successive coalescence. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_06020 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Electron-only reconnection and inverse magnetic-energy transfer at sub-ion scales Liu, Zhuo Silva, Caio Milanese, Lucio M. Zhou, Muni Mandell, Noah R. Loureiro, Nuno F. Plasma Physics Solar and Stellar Astrophysics Space Physics We derive, and validate numerically, an analytical model for electron-only magnetic reconnection applicable to strongly magnetized plasmas. Our model predicts sub-ion-scale reconnection rates significantly higher than those pertaining to large-scale reconnection, aligning with recent observations and simulations. We apply this reconnection model to the problem of inverse magnetic energy transfer at sub-ion scales. We derive time-dependent scaling laws for the magnetic energy decay and the typical magnetic structure dimensions that differ from those previously found in the MHD regime. These scaling laws are validated via two- and three-dimensional simulations, demonstrating that sub-ion scale magnetic fields can reach large, system-size scales via successive coalescence. |
| title | Electron-only reconnection and inverse magnetic-energy transfer at sub-ion scales |
| topic | Plasma Physics Solar and Stellar Astrophysics Space Physics |
| url | https://arxiv.org/abs/2407.06020 |