Global scale-invariant dissipation in collisionless plasma turbulence

TL;DR

This paper presents a multiscale analysis of collisionless plasma turbulence, revealing a transition from multifractal to monoscaling behavior in the dissipation range, providing key observational constraints for dissipation theories.

Contribution

It offers the first detailed high-frequency magnetic field measurements analysis across five decades of scales, highlighting a scale-invariant dissipation characteristic in collisionless plasma turbulence.

Findings

Transition from multifractal to monoscaling turbulence in the dissipation range

Observation of scale-invariant dissipation in collisionless plasma

Provides constraints for theoretical models of plasma dissipation

Abstract

A higher-order multiscale analysis of the dissipation range of collisionless plasma turbulence is presented using in-situ high-frequency magnetic field measurements from the Cluster spacecraft in a stationary interval of fast ambient solar wind. The observations, spanning five decades in temporal scales, show a crossover from multifractal intermittent turbulence in the inertial range to non-Gaussian monoscaling in the dissipation range. This presents a strong observational constraint on theories of dissipation mechanisms in turbulent collisionless plasmas.