A heuristic model for MRI turbulent stresses in Hall MHD

TL;DR

This paper develops a heuristic model for MRI-driven turbulent stresses in Hall MHD, revealing how the Hall effect influences energy partition and stresses, with implications for astrophysical phenomena like the solar wind.

Contribution

It introduces a novel heuristic model incorporating Hall effects into MRI turbulence, extending previous models and highlighting the impact on energy distribution and stress behavior.

Findings

Hall term modifies Reynolds and Maxwell stresses.

Energy ratio depends on Hall parameter, not initial conditions.

Model contrasts with Kazantsev dynamo theory, showing limitations of the latter.

Abstract

Although the Shakura-Sunyaev $\alpha$ viscosity prescription has been highly successful in characterizing myriad astrophysical environments, it has proven to be partly inadequate in modelling turbulent stresses driven by the MRI. Hence, we adopt the approach employed by \citet{GIO03}, but in the context of Hall magnetohydrodynamics (MHD), to study MRI turbulence. We utilize the exact evolution equations for the stresses, and the non-linear terms are closed through the invocation of dimensional analysis and physical considerations. We demonstrate that the inclusion of the Hall term leads to non-trivial results, including the modification of the Reynolds and Maxwell stresses, as well as the (asymptotic) non-equipartition between the kinetic and magnetic energies; the latter issue is also addressed via the analysis of non-linear waves. The asymptotic ratio of the kinetic and magnetic energies is shown to be \emph{independent} of the choice of initial conditions, but it is governed by the \emph{Hall parameter}. We contrast our model with the Kazantsev prescription from small-scale dynamo theory, and the Hall term does not contribute in the latter approach, illustrating the limitations of the Kazantsev formalism. We indicate potential astrophysical applications of our model, including the solar wind where a lack of equipartition has been observed.