Constraining Alfvénic Turbulence with Helicity Invariants
arXiv:2005.03556
Abstract
In this paper, we study the constraints imposed by the invariants (generalized helicities and energy) of extended magnetohydrodynamics on some global characteristics of turbulence. We show that the global turbulent kinetic and magnetic energies will approach equipartition only under certain circumstances that depend on the ratio of the generalized helicities. In systems with minimal thermal energy, we demonstrate that the three invariants collectively determine the characteristic length scale associated with Alfvénic turbulence.
Accepted for publication in MNRAS; 6 pages; 3 figures