Global Scale-Invariant Dissipation in Collisionless Plasma Turbulence
Sahraoui, F.; Dunlop, M. W.; Khotyaintsev, Yu. V.; Chapman, S. C.; Kiyani, K. H.
United Kingdom, Sweden, United States, France
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.