Precursor Wave Amplification by Ion-Electron Coupling through Wakefield in Relativistic Shocks

We investigated electromagnetic precursor wave emission in relativistic shocks by using two-dimensional particle-in-cell simulations. We found that the wave amplitude is significantly enhanced by a positive feedback process associated with ion-electron coupling through the wakefields for high magnet...

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Published inAstrophysical journal. Letters Vol. 883; no. 2; p. L35
Main Authors Iwamoto, Masanori, Amano, Takanobu, Hoshino, Masahiro, Matsumoto, Yosuke, Niemiec, Jacek, Ligorini, Arianna, Kobzar, Oleh, Pohl, Martin
Format Journal Article
LanguageEnglish
Published Austin The American Astronomical Society 01.10.2019
IOP Publishing
Subjects
Cosmic rays
Coupling
Electrons
Emission analysis
High energy astrophysics
Ions
Particle acceleration
Particle in cell technique
Plasma physics
Positive feedback
Precursors
Relativism
Relativistic effects
Shocks
Wave amplification
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Summary:We investigated electromagnetic precursor wave emission in relativistic shocks by using two-dimensional particle-in-cell simulations. We found that the wave amplitude is significantly enhanced by a positive feedback process associated with ion-electron coupling through the wakefields for high magnetization. The wakefields collapse during the nonlinear process of the parametric decay instability in the near-upstream region, where nonthermal electrons and ions are generated. The intense coherent emission and the particle acceleration may operate in high-energy astrophysical objects.
Bibliography:AAS19645
ISSN:2041-8205
2041-8213
DOI:10.3847/2041-8213/ab4265