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Exact law for homogeneous compressible Hall magnetohydrodynamics turbulence.

Authors :
Andrés, N.
Galtier, S.
Sahraoui, F.
Source :
Physical Review E. Jan2018, Vol. 97 Issue 1, p1-1. 1p.
Publication Year :
2018

Abstract

We derive an exact law for three-dimensional (3D) homogeneous compressible isothermal Hall magnetohydrodynamic turbulence, without the assumption of isotropy. The Hall current is shown to introduce new flux and source terms that act at the small scales (comparable or smaller than the ion skin depth) to significantly impact the turbulence dynamics. The law provides an accurate means to estimate the energy cascade rate over a broad range of scales covering the magnetohydrodynamic inertial range and the sub-ion dispersive range in 3D numerical simulations and in in situ spacecraft observations of compressible turbulence. This work is particularly relevant to astrophysical flows in which small-scale density fluctuations cannot be ignored such as the solar wind, planetary magnetospheres, and the interstellar medium. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
24700045
Volume :
97
Issue :
1
Database :
Academic Search Index
Journal :
Physical Review E
Publication Type :
Academic Journal
Accession number :
128031151
Full Text :
https://doi.org/10.1103/PhysRevE.97.013204