Multiscale structures in three species magnetoplasmas with two positive ions

TL;DR

This paper explores how multi-ion magnetoplasmas self-organize into complex multiscale magnetic and flow structures, revealing the natural emergence of dynamo mechanisms and potential plasma heating processes.

Contribution

It demonstrates the formation of Quadruple Beltrami states in multi-ion plasmas and analyzes their dependence on plasma parameters, highlighting multiscale magnetic and velocity field configurations.

Findings

Magnetic fields self-organize into Quadruple Beltrami states.

Relaxed fields vary on different length scales.

Dynamo mechanisms naturally emerge in these states.

Abstract

The self-organization in a multi-ion plasma composed of electrons and two species of positively charged ions is investigated. It is shown that when canonical vorticities and velocities of all the plasma fluids are aligned, the magnetic field self-organizes to Quadruple Beltrami state (superposition of four Beltrami fields). The self-organized magnetic and velocity fields strongly depend on the relative strengths of the generalized vorticities, flows, inertia and densities of the plasma species. Thus, it is possible to generate a wide variety of multiscale magnetic field and flow structures. It is also shown that relaxed magnetic fields and velocities can vary on vastly different length scales simultaneously and are coupled together through singular perturbation generated by Hall effect. In this multi Beltrami self-organized states, then, the dynamo mechanism emerges naturally. The scale separation also suggests the heating of the plasma through a dissipative process. The work could be useful to study the dynamics and morphology of the multiscale magnetic field configurations in laboratory and astrophysical plasmas.