Current sheets and collisionless damping in kinetic plasma turbulence

J. M. Tenbarge, G. G. Howes

Research output: Contribution to journalArticlepeer-review

123 Scopus citations

Abstract

We present the first study of the formation and dissipation of current sheets at electron scales in a wave-driven, weakly collisional, three-dimensional kinetic turbulence simulation. We investigate the relative importance of dissipation associated with collisionless damping via resonant wave-particle interactions versus dissipation in small-scale current sheets in weakly collisional plasma turbulence. Current sheets form self-consistently from the wave-driven turbulence, and their filling fraction is well correlated to the electron heating rate. However, the weakly collisional nature of the simulation necessarily implies that the current sheets are not significantly dissipated via Ohmic dissipation. Rather, collisionless damping via the Landau resonance with the electrons is sufficient to account for the measured heating as a function of scale in the simulation, without the need for significant Ohmic dissipation. This finding suggests the possibility that the dissipation of the current sheets is governed by resonant wave-particle interactions and that the locations of current sheets correspond spatially to regions of enhanced heating.

Original languageEnglish (US)
Article numberL27
JournalAstrophysical Journal Letters
Volume771
Issue number2
DOIs
StatePublished - Jul 10 2013
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • plasmas
  • solar wind
  • turbulence

Fingerprint

Dive into the research topics of 'Current sheets and collisionless damping in kinetic plasma turbulence'. Together they form a unique fingerprint.

Cite this