Analysis of Magnetic Fields in Inertial Alfven Wave Collisions

TL;DR

This paper presents the first laboratory evidence of nonlinear interactions in inertial Alfven wave turbulence, highlighting how dispersive effects modify turbulence dynamics in magnetospheric plasmas compared to ideal MHD models.

Contribution

It provides experimental validation of inertial Alfven wave interactions and compares these findings with existing MHD Alfven wave theories.

Findings

First laboratory evidence of inertial Alfven wave nonlinear interactions

Dispersive effects alter turbulence behavior in the inertial regime

Comparison with MHD theory highlights differences in wave interactions

Abstract

Turbulence in astrophysical and space plasmas is dominated by the nonlinear interaction of counterpropagating Alfven waves. Most Alfven wave turbulence theories have been based on ideal plasma models, such as incompressible MHD, for Alfven waves at large scales. However, in the inertial Alfven wave regime (vA > vthe), relevant to magnetospheric plasmas, how the turbulent nonlinear interactions are modified by the dispersive nature of the waves remains to be explored. Here we present the first laboratory evidence of the nonlinear interaction in the inertial regime. A comparison is made with the theory for MHD Alfven waves.