Turbulent dynamo in the terrestrial magnetosheath
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arXiv
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| Autori principali: | , , , , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866908919108993024 |
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| author | Vörös, Zoltán Roberts, Owen Wyn Narita, Yasuhito Yordanova, Emiliya Nakamura, Rumi Settino, Adriana Schmid, Daniel Volwerk, Martin Wedlund, Cyril L. Simon Varsani, Ali Sorriso-Valvo, Luca Bourdin, Philippe-A. Kis, Árpád |
| author_facet | Vörös, Zoltán Roberts, Owen Wyn Narita, Yasuhito Yordanova, Emiliya Nakamura, Rumi Settino, Adriana Schmid, Daniel Volwerk, Martin Wedlund, Cyril L. Simon Varsani, Ali Sorriso-Valvo, Luca Bourdin, Philippe-A. Kis, Árpád |
| contents | Dynamo action refers to energy exchange processes through which magnetic fields are generated at the expense of kinetic energy of the plasma flows. Dynamos can generate magnetic fields across scales larger or smaller than the flows themselves. Multi-scale dynamo processes underpin magnetic phenomena from planetary cores to stellar and galactic environments, while also shaping turbulent magnetic fields at smaller scales. Yet, experimental validation of dynamo action has remained largely confined to laboratories. Here we report evidence for a turbulent dynamo in the terrestrial magnetosheath. Observations reveal the predicted spatial topology of stretched and folded magnetic fields, compressive effects, and pressure anisotropy instabilities essential for magnetic field amplification. Our findings also highlight the central role of turbulent dynamos in energy conversion and structure formation within collisionless plasma turbulence. The observed energy exchange signatures indicate that the magnetosheath may serve as a natural testbed for validating dynamo theories and simulations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_27419 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Turbulent dynamo in the terrestrial magnetosheath Vörös, Zoltán Roberts, Owen Wyn Narita, Yasuhito Yordanova, Emiliya Nakamura, Rumi Settino, Adriana Schmid, Daniel Volwerk, Martin Wedlund, Cyril L. Simon Varsani, Ali Sorriso-Valvo, Luca Bourdin, Philippe-A. Kis, Árpád Space Physics Earth and Planetary Astrophysics Plasma Physics Dynamo action refers to energy exchange processes through which magnetic fields are generated at the expense of kinetic energy of the plasma flows. Dynamos can generate magnetic fields across scales larger or smaller than the flows themselves. Multi-scale dynamo processes underpin magnetic phenomena from planetary cores to stellar and galactic environments, while also shaping turbulent magnetic fields at smaller scales. Yet, experimental validation of dynamo action has remained largely confined to laboratories. Here we report evidence for a turbulent dynamo in the terrestrial magnetosheath. Observations reveal the predicted spatial topology of stretched and folded magnetic fields, compressive effects, and pressure anisotropy instabilities essential for magnetic field amplification. Our findings also highlight the central role of turbulent dynamos in energy conversion and structure formation within collisionless plasma turbulence. The observed energy exchange signatures indicate that the magnetosheath may serve as a natural testbed for validating dynamo theories and simulations. |
| title | Turbulent dynamo in the terrestrial magnetosheath |
| topic | Space Physics Earth and Planetary Astrophysics Plasma Physics |
| url | https://arxiv.org/abs/2603.27419 |