Journal
PHYSICS OF PLASMAS
Volume 24, Issue 7, Pages -Publisher
AIP Publishing
DOI: 10.1063/1.4990421
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Funding
- NASA [NNX14AI63G]
- Parker Solar Probe science team (ISOIS/SWRI) [D99031L]
- MMS Theory and Modeling team [NNX14AC39G]
- China Scholarship Council
- National Natural Science Foundation of China (NSFC) [11672123]
- [AGS-1460130]
- Directorate For Geosciences
- Div Atmospheric & Geospace Sciences [1460130] Funding Source: National Science Foundation
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Kinetic plasma turbulence cascade spans multiple scales ranging from macroscopic fluid flow to sub-electron scales. Mechanisms that dissipate large scale energy, terminate the inertial range cascade, and convert kinetic energy into heat are hotly debated. Here, we revisit these puzzles using fully kinetic simulation. By performing scale-dependent spatial filtering on the Vlasov equation, we extract information at prescribed scales and introduce several energy transfer functions. This approach allows highly inhomogeneous energy cascade to be quantified as it proceeds down to kinetic scales. The pressure work, -(P . del) . u, can trigger a channel of the energy conversion between fluid flow and random motions, which contains a collision-free generalization of the viscous dissipation in collisional fluid. Both the energy transfer and the pressure work are strongly correlated with velocity gradients. Published by AIP Publishing.
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