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Cross-helicity effect on α-type dynamo in non-equilibrium turbulence
Stockholm University, Nordic Institute for Theoretical Physics (Nordita). Stockholm University, Faculty of Science, Department of Astronomy. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). School of Natural Sciences and Medicine, Georgia; Carnegie Mellon University, USA.ORCID iD: 0000-0002-7304-021X
Number of Authors: 32023 (English)In: Journal of Plasma Physics, ISSN 0022-3778, E-ISSN 1469-7807, Vol. 89, no 4, article id 905890412Article in journal (Refereed) Published
Abstract [en]

Turbulence is typically not in equilibrium, i.e. mean quantities such as the mean energy and helicity are typically time-dependent. The effect of non-stationarity on the turbulent hydromagnetic dynamo process is studied here with the use of the two-scale direct-interaction approximation, which allows one to explicitly relate the mean turbulent Reynolds and Maxwell stresses and the mean electromotive force to the spectral characteristics of turbulence, such as the mean energy, as well as kinetic and cross-helicity. It is demonstrated that the non-equilibrium effects can enhance the dynamo process when the magnetohydrodynamic turbulence is both helical and cross-helical. This effect is based on the turbulent infinitesimal-impulse cross-response functions, which do not affect turbulent flows in equilibrium. The evolution and sources of the cross-helicity in magnetohydrodynamic turbulence are also discussed.

Place, publisher, year, edition, pages
2023. Vol. 89, no 4, article id 905890412
Keywords [en]
astrophysical plasmas, plasma dynamics, plasma nonlinear phenomena
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-221074DOI: 10.1017/S0022377823000545ISI: 001043287300001Scopus ID: 2-s2.0-85168806727OAI: oai:DiVA.org:su-221074DiVA, id: diva2:1799846
Available from: 2023-09-25 Created: 2023-09-25 Last updated: 2023-09-25Bibliographically approved

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Brandenburg, Axel

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Nordic Institute for Theoretical Physics (Nordita)Department of AstronomyThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
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