Interplay between intermittency and dissipation in collisionless plasma turbulence

Abstract

We study the damping of collisionless Alfvénic turbulence by two mechanisms: stochastic heating (whose efficiency depends on the local turbulence amplitude $\delta z_{\lambda }$) and linear Landau damping (whose efficiency is independent of $\delta z_{\lambda }$), describing in detail how they affect and are affected by intermittency. The overall efficiency of linear Landau damping is not affected by intermittency in critically balanced turbulence, while stochastic heating is much more efficient in the presence of intermittent turbulence. Moreover, stochastic heating leads to a drop in the scale-dependent kurtosis over a narrow range of scales around the ion gyroscale.

arXiv comment15 pages, 3 figures, accepted to JPP

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• Kinetic Turbulence in Astrophysical Plasmas: Waves and/or Structures?
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• Evaluation of scale-dependent kurtosis with HelioSwarm
• External charged debris in a flowing plasma : charge fluctuation induced complexity