PIC simulation of a quasi-parallel collisionless shock: Interaction between upstream waves and backstreaming ions

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Abstract

We perform a one-dimensional full particle-in-cell (PIC) simulation of a quasi-parallel collisionless shock with Alfvén Mach number 6.6 and the shock angle 20 degrees between the upstream magnetic field and the shock normal direction. The FAB far upstream is generated by a reflection of incoming ions at the shock. They excite a right-handed Alfvén wave in the plasma rest frame through resonant beam instability. Both pitch-angle and energy diffusions of the FAB take place, as one approaches the shock. The maximum energy of the FAB near the shock is about 10 times larger than the energy in which the specular reflection at the shock is assumed. Nonlinear phase bunches of the FAB and the background ions are found near the shock due to the resonant and non-resonant trappings by the excited wave, respectively.

Original languageEnglish
Article number100709
JournalHigh Energy Density Physics
Volume33
DOIs
Publication statusPublished - Nov 1 2019

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upstream
shock
FORTRAN
cells
ions
simulation
interactions
specular reflection
pitch (inclination)
Mach number
energy
trapping
magnetic fields

All Science Journal Classification (ASJC) codes

  • Radiation
  • Nuclear and High Energy Physics

Cite this

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title = "PIC simulation of a quasi-parallel collisionless shock: Interaction between upstream waves and backstreaming ions",
abstract = "We perform a one-dimensional full particle-in-cell (PIC) simulation of a quasi-parallel collisionless shock with Alfv{\'e}n Mach number 6.6 and the shock angle 20 degrees between the upstream magnetic field and the shock normal direction. The FAB far upstream is generated by a reflection of incoming ions at the shock. They excite a right-handed Alfv{\'e}n wave in the plasma rest frame through resonant beam instability. Both pitch-angle and energy diffusions of the FAB take place, as one approaches the shock. The maximum energy of the FAB near the shock is about 10 times larger than the energy in which the specular reflection at the shock is assumed. Nonlinear phase bunches of the FAB and the background ions are found near the shock due to the resonant and non-resonant trappings by the excited wave, respectively.",
author = "F. Otsuka and Shuichi Matsukiyo and Tohru Hada",
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T1 - PIC simulation of a quasi-parallel collisionless shock

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AU - Otsuka, F.

AU - Matsukiyo, Shuichi

AU - Hada, Tohru

PY - 2019/11/1

Y1 - 2019/11/1

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AB - We perform a one-dimensional full particle-in-cell (PIC) simulation of a quasi-parallel collisionless shock with Alfvén Mach number 6.6 and the shock angle 20 degrees between the upstream magnetic field and the shock normal direction. The FAB far upstream is generated by a reflection of incoming ions at the shock. They excite a right-handed Alfvén wave in the plasma rest frame through resonant beam instability. Both pitch-angle and energy diffusions of the FAB take place, as one approaches the shock. The maximum energy of the FAB near the shock is about 10 times larger than the energy in which the specular reflection at the shock is assumed. Nonlinear phase bunches of the FAB and the background ions are found near the shock due to the resonant and non-resonant trappings by the excited wave, respectively.

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