Leveling of MHD turbulence imbalance in shear flows
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arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866910022111330304 |
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| author | Kavtaradze, M. Mamatsashvili, G. Chagelishvili, G. Uchava, E. |
| author_facet | Kavtaradze, M. Mamatsashvili, G. Chagelishvili, G. Uchava, E. |
| contents | We investigate magnetohydrodynamic (MHD) turbulence in plane shear flows with a streamwise background magnetic field in the super-Alfvénic regime. We show that the large-scale velocity shear suppresses turbulence imbalance, driving the system toward a balanced state -- the energies of counter-propagating Alfvén waves become essentially equal, even at initially perfectly imbalanced Alfvénic turbulence. This balancing is due to the shear-induced linear non-modal dynamics of Alfvén waves, including their transient growth and over-reflection. This linear route to balancing turbulence is new -- fundamentally different from nonlinear ones operative in shearless MHD turbulence -- and have direct implications for understanding balanced/imbalanced MHD turbulence in the solar wind, which is modeled as a shear flow in a thermodynamically complex plasma. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_13528 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Leveling of MHD turbulence imbalance in shear flows Kavtaradze, M. Mamatsashvili, G. Chagelishvili, G. Uchava, E. Space Physics Solar and Stellar Astrophysics Fluid Dynamics Plasma Physics We investigate magnetohydrodynamic (MHD) turbulence in plane shear flows with a streamwise background magnetic field in the super-Alfvénic regime. We show that the large-scale velocity shear suppresses turbulence imbalance, driving the system toward a balanced state -- the energies of counter-propagating Alfvén waves become essentially equal, even at initially perfectly imbalanced Alfvénic turbulence. This balancing is due to the shear-induced linear non-modal dynamics of Alfvén waves, including their transient growth and over-reflection. This linear route to balancing turbulence is new -- fundamentally different from nonlinear ones operative in shearless MHD turbulence -- and have direct implications for understanding balanced/imbalanced MHD turbulence in the solar wind, which is modeled as a shear flow in a thermodynamically complex plasma. |
| title | Leveling of MHD turbulence imbalance in shear flows |
| topic | Space Physics Solar and Stellar Astrophysics Fluid Dynamics Plasma Physics |
| url | https://arxiv.org/abs/2602.13528 |