期刊
JOURNAL OF PLASMA PHYSICS
卷 86, 期 4, 页码 -出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S0022377820000689
关键词
plasma nonlinear phenomena; space plasma physics; plasma simulation
资金
- NASA [80NSSC19K1390, 80NSSC19K0912, HSR 80NSSC18K1217, HGI 80NSSC18K0643, MMSGI 80NSSC18K1371]
- NSF SHINE award [AGS-1622306]
- Agenzia Spaziale Italiana [ASI-INAF 2015-0390R.O]
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.
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