Nonhelical inverse transfer of a decaying turbulent magnetic field

Physical Review Letters
Axel BrandenburgAlexander G Tevzadze

Abstract

In the presence of magnetic helicity, inverse transfer from small to large scales is well known in magnetohydrodynamic (MHD) turbulence and has applications in astrophysics, cosmology, and fusion plasmas. Using high resolution direct numerical simulations of magnetically dominated self-similarly decaying MHD turbulence, we report a similar inverse transfer even in the absence of magnetic helicity. We compute for the first time spectral energy transfer rates to show that this inverse transfer is about half as strong as with helicity, but in both cases the magnetic gain at large scales results from velocity at similar scales interacting with smaller-scale magnetic fields. This suggests that both inverse transfers are a consequence of universal mechanisms for magnetically dominated turbulence. Possible explanations include inverse cascading of the mean squared vector potential associated with local near two dimensionality and the shallower k^{2} subinertial range spectrum of kinetic energy forcing the magnetic field with a k^{4} subinertial range to attain larger-scale coherence. The inertial range shows a clear k^{-2} spectrum and is the first example of fully isotropic magnetically dominated MHD turbulence exhibiting weak turbul...Continue Reading

References

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Citations

Jan 20, 2018·Physical Review. E·Johannes Reppin, Robi Banerjee
Jun 1, 2016·Reports on Progress in Physics·Kandaswamy Subramanian
Sep 16, 2015·Physical Review Letters·William E EastRoger D Blandford
Feb 18, 2017·Physical Review Letters·Axel Brandenburg, Tina Kahniashvili
May 30, 2020·Physical Review Letters·Mark MaceSayantan Sharma
Aug 7, 2019·Physical Review Letters·Karsten Jedamzik, Andrey Saveliev
Jul 22, 2015·Physical Review Letters·M F LinkmannM E McKay
Aug 8, 2018·Physical Review Letters·F MiniatiS Sarkar
Nov 17, 2020·Physical Review Letters·Karsten Jedamzik, Levon Pogosian
May 21, 2021·Reports on Progress in Physics·Tanmay Vachaspati

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