Comparative study of gyrokinetic, hybrid-kinetic and fully kinetic wave physics for space plasmas
arXiv:1605.08385 · doi:10.1088/1367-2630/18/6/065011
Abstract
A set of numerical solvers for the linear dispersion relations of the gyrokinetic, the hybrid-kinetic, and the fully kinetic model is employed to study the physics of the kinetic Alfvén wave and the fast magnetosonic mode in these models. In particular, we focus on parameters that are relevant for solar wind oriented applications (using a homogeneous, isotropic background), which are characterized by wave propagation angles averaging close to 90°. It is found that the gyrokinetic model, while lacking high-frequency solutions and cyclotron effects, faithfully reproduces the fully kinetic Alfvén wave physics close to, and sometimes significantly beyond, the boundaries of its range of validity. The hybrid-kinetic model, on the other hand, is much more complete in terms of high-frequency waves, but owing to its simple electron model it is found to severely underpredict wave damping rates even on ion spatial scales across a large range of parameters, despite containing full kinetic ion physics.
arXiv comment22 pages, 12 figures, submitted to New J. Phys
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- Properties of magnetohydrodynamic modes in compressively driven plasma turbulence
- On stochastic heating and its phase-space signatures in low- kinetic turbulence
- Kinetic plasma turbulence: recent insights and open questions from 3D3V simulations
- Stability Analysis of Core-Strahl Electron Distributions in the Solar Wind
- Three-dimensional magnetic reconnection in particle-in-cell simulations of anisotropic plasma turbulence
- Extended MHD turbulence and its applications to the solar wind
- Bridging hybrid- and full-kinetic models with Landau-fluid electrons: I. 2D magnetic reconnection
- Sub-grid-scale effects in magnetised plasma turbulence
- Quasilinear gyrokinetic theory: A derivation of QuaLiKiz