Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 468, Issue 4, Pages 4025-4029Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stx611
Keywords
magnetic fields; MHD; plasmas; turbulence
Categories
Funding
- NSF [AST-1411879]
- National Science Foundation [NSF AGS-1261659]
- Vilas Associates Award from the University of Wisconsin-Madison
- EPSRC [EP/M004546/1]
- PRACE
- Engineering and Physical Sciences Research Council [EP/M004546/1] Funding Source: researchfish
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1411879] Funding Source: National Science Foundation
- EPSRC [EP/M004546/1] Funding Source: UKRI
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In magnetohydrodynamic (MHD) turbulence, the large-scale magnetic field sets a preferred local direction for the small-scale dynamics, altering the statistics of turbulence from the isotropic case. This happens even in the absence of a total magnetic flux, since MHD turbulence forms randomly oriented large-scale domains of strong magnetic field. It is therefore customary to study small-scale magnetic plasma turbulence by assuming a strong background magnetic field relative to the turbulent fluctuations. This is done, for example, in reduced models of plasmas, such as reduced MHD, reduced-dimension kinetic models, gyrokinetics, etc., which make theoretical calculations easier and numerical computations cheaper. Recently, however, it has become clear that the turbulent energy dissipation is concentrated in the regions of strong magnetic field variations. A significant fraction of the energy dissipation may be localized in very small volumes corresponding to the boundaries between strongly magnetized domains. In these regions, the reduced models are not applicable. This has important implications for studies of particle heating and acceleration in magnetic plasma turbulence. The goal of this work is to systematically investigate the relationship between local magnetic field variations and magnetic energy dissipation, and to understand its implications for modelling energy dissipation in realistic turbulent plasmas.
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