On the compressibility effect in test particle acceleration by magnetohydrodynamic turbulence

@article{Gonzalez2016OnTC,
  title={On the compressibility effect in test particle acceleration by magnetohydrodynamic turbulence},
  author={C. A. Gonz'alez and Pablo A. Dmitruk and Pablo D. Mininni and William H. Matthaeus},
  journal={Physics of Plasmas},
  year={2016},
  volume={23},
  pages={082305}
}
The effect of compressibility in a charged particle energization by magnetohydrodynamic (MHD) fields is studied in the context of test particle simulations. This problem is relevant to the solar wind and the solar corona due to the compressible nature of the flow in those astrophysical scenarios. We consider turbulent electromagnetic fields obtained from direct numerical simulations of the MHD equations with a strong background magnetic field. In order to explore the flow compressibility effect… Expand

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References

SHOWING 1-10 OF 25 REFERENCES
Test particle acceleration in three‐dimensional Hall MHD turbulence
[1] Numerical experiments of test particle acceleration are performed using turbulent magnetic and electric fields obtained from direct numerical solutions of the compressible three-dimensional HallExpand
Test Particle Energization by Current Sheets and Nonuniform Fields in Magnetohydrodynamic Turbulence
We perform numerical experiments of test particle energization in turbulent magnetic and electric fields obtained from pseudospectral direct numerical solutions of compressible three-dimensionalExpand
THE EFFICIENCY OF SECOND-ORDER FERMI ACCELERATION BY WEAKLY COMPRESSIBLE MAGNETOHYDRODYNAMIC TURBULENCE
We investigate the effects of pitch-angle scattering on the efficiency of particle heating and acceleration by MHD turbulence using phenomenological estimates and simulations of non-relativistic testExpand
TEST-PARTICLE ACCELERATION IN A HIERARCHICAL THREE-DIMENSIONAL TURBULENCE MODEL
The acceleration of charged particles is relevant to the solar corona over a broad range of scales and energies. High-energy particles are usually detected in concomitance with large energy releaseExpand
Acceleration of particles in imbalanced magnetohydrodynamic turbulence.
TLDR
This work investigates the acceleration of test particles, relevant to the solar-wind problem, in balanced and imbalanced magnetohydrodynamic turbulence, and finds that the acceleration rate of charged particles is reduced and the heating rate diminished. Expand
Test particle acceleration in turbulent reconnecting magnetic fields
The induced electric field produced by magnetohydrodynamic processes can accelerate test particles very efficiently under certain circumstances. Numerical experiments indicate that particles areExpand
Particle Acceleration by Slow Modes in Strong Compressible Magnetohydrodynamic Turbulence, with Application to Solar Flares
Energetic particles that undergo strong pitch-angle scattering and diffuse through a plasma containing strong compressible MHD turbulence undergo diffusion in momentum space with diffusionExpand
Turbulence, Magnetic Reconnection in Turbulent Fluids and Energetic Particle Acceleration
Turbulence is ubiquitous in astrophysics. It radically changes many astrophysical phenomena, in particular, the propagation and acceleration of cosmic rays. We present the modern understanding ofExpand
Particle Acceleration in Multiple Dissipation Regions
The sharp magnetic discontinuities that naturally appear in solar magnetic flux tubes driven by turbulent photospheric motions are associated with intense currents. Parker proposed that theseExpand
Particle Acceleration by Magnetohydrodynamic Turbulence
Recent advances in understanding of MHD turbulence call for revisions in the picture of particle acceleration. We make use of the recently established scaling of slow and fast MHD modes in strong andExpand
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