Isolation and Phase-Space Energization Analysis of the Instabilities in Collisionless Shocks

Abstract

We analyze the generation of kinetic instabilities and their effect on the energization of ions in non-relativistic, oblique collisionless shocks using a 3D-3V simulation by $\text{dHybridR}$, a hybrid particle-in-cell code. At sufficiently high Mach number, quasi-perpendicular and oblique shocks can experience rippling of the shock surface caused by kinetic instabilities arising from free energy in the ion velocity distribution due to the combination of the incoming ion beam and the population of ions reflected at the shock front. To understand the role of the ripple on particle energization, we devise the new instability isolation method to identify the unstable modes underlying the ripple and interpret the results in terms of the governing kinetic instability. We generate velocity-space signatures using the field-particle correlation technique to look at energy transfer in phase space from the isolated instability driving the shock ripple, providing a viewpoint on the different dynamics of distinct populations of ions in phase space. We generate velocity-space signatures of the energy transfer in phase space of the isolated instability driving the shock ripple using the field-particle correlation technique. Together, the field-particle correlation technique and our new instability isolation method provide a unique viewpoint on the different dynamics of distinct populations of ions in phase space and allow us to completely characterize the energetics of the collisionless shock under investigation.

32 pages, 14 figures, accepted by the Journal of Plasma Physics

References in corpus (15)

• The Solar Orbiter mission -- Science overview
• Predicted Impacts of Proton Temperature Anisotropy on Solar Wind Turbulence
• Measuring Collisionless Damping in Heliospheric Plasmas using Field-Particle Correlations
• Validity of the Taylor Hypothesis for Linear Kinetic Waves in the Weakly Collisional Solar Wind
• Diagnosing collisionless energy transfer using field-particle correlations: gyrokinetic turbulence
• Kinetic Simulations of Cosmic-Ray-Modified Shocks II: Particle Spectra
• Kinetic Simulations of Cosmic-Ray-Modified Shocks I: Hydrodynamics
• A Prospectus on Kinetic Heliophysics
• Diagnosing collisionless energy transfer using field-particle correlations: Alfven-Ion Cyclotron Turbulence
• dHybridR: a Hybrid--Particle-in-Cell Code Including Relativistic Ion Dynamics
• The Importance of Electron Landau Damping for the Dissipation of Turbulent Energy in Terrestrial Magnetosheath Plasma
• Particle-in-cell simulations of particle energization via shock drift acceleration from low Mach number quasi-perpendicular shocks in solar flares
• A Field-Particle Correlation Analysis of a Perpendicular Magnetized Collisionless Shock
• Phase Space Energization of Ions in Oblique Shocks
• The effect of variations in magnetic field direction from turbulence on kinetic-scale instabilities

Cited by in corpus (1)

• Unveiling the Velocity-Space Signature of Ion Cyclotron Damping Using Liouville Mapping