Diagnosing collisionless energy transfer using field–particle correlations: Alfvén-ion cyclotron turbulence
AffiliationUniv Arizona, Lunar & Planetary Lab
MetadataShow full item record
PublisherCambridge University Press (CUP)
CitationKlein, K., Howes, G., TenBarge, J., & Valentini, F. (2020). Diagnosing collisionless energy transfer using field–particle correlations: Alfvén-ion cyclotron turbulence. Journal of Plasma Physics, 86(4), 905860402. doi:10.1017/S0022377820000689
JournalJOURNAL OF PLASMA PHYSICS
RightsCopyright © The Author(s), 2020. Published by Cambridge University Press.
Collection InformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at email@example.com.
AbstractWe 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.
Note6 month embargo; published online by Cambridge University Press: 24 July 2020
VersionFinal accepted manuscript