Journal article
Diagnosing collisionless energy transfer using field-particle correlations: Alfven-ion cyclotron turbulence
Journal of plasma physics, Vol.86(4), 905860402
08/01/2020
DOI: 10.1017/S0022377820000689
Abstract
We apply field-particle correlations - a technique that tracks the time-averaged velocity-space structure of the energy density transfer rate between electromagnetic fields and plasma particles - to data drawn from a hybrid Vlasov-Maxwell simulation of Alfven-ion cyclotron turbulence. Energy transfer in this system is expected to include both Landau and cyclotron wave-particle resonances, unlike previous systems to which the field-particle correlation technique has been applied. In this simulation, the energy transfer rate mediated by the parallel electric field E-parallel to comprises approximately 60% of the total rate, with the remainder mediated by the perpendicular electric field E-perpendicular to. The parallel electric field resonantly couples to protons, with the canonical bipolar velocity-space signature of Landau damping identified at many points throughout the simulation. The energy transfer mediated by E-perpendicular to preferentially couples to particles with v(tp) less than or similar to v(perpendicular to) less than or similar to 3 v(tp), where vtp is the proton thermal speed, in agreement with the expected formation of a cyclotron diffusion plateau. Our results demonstrate clearly that the field-particle correlation technique can distinguish distinct channels of energy transfer using single-point measurements, even at points in which multiple channels act simultaneously, and can be used to determine quantitatively the rates of particle energization in each channel.
Details
- Title: Subtitle
- Diagnosing collisionless energy transfer using field-particle correlations: Alfven-ion cyclotron turbulence
- Creators
- Kristopher G. Klein - University of ArizonaGregory G. Howes - University of IowaJason M. TenBarge - Princeton UniversityFrancesco Valentini - University of Calabria
- Resource Type
- Journal article
- Publication Details
- Journal of plasma physics, Vol.86(4), 905860402
- Publisher
- Cambridge Univ Press
- DOI
- 10.1017/S0022377820000689
- ISSN
- 0022-3778
- eISSN
- 1469-7807
- Number of pages
- 33
- Grant note
- 80NSSC19K1390; 80NSSC19K0912; HSR 80NSSC18K1217; HGI 80NSSC18K0643; MMSGI 80NSSC18K1371 / NASA; National Aeronautics & Space Administration (NASA) ASI-INAF 2015-0390R.O / Agenzia Spaziale Italiana; Agenzia Spaziale Italiana (ASI) AGS-1622306 / NSF SHINE award; National Science Foundation (NSF); NSF - Directorate for Geosciences (GEO)
- Language
- English
- Date published
- 08/01/2020
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984428778002771
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