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Magnetic field amplification by the Weibel instability at planetary and astrophysical high-Mach-number shocks

Collisionless shocks are ubiquitous in the Universe and often associated with strong magnetic field. Here we use large-scale particle-in-cell simulations of non-relativistic perpendicular shocks in the high-Mach-number regime to study the amplification of magnetic field within shocks. The magnetic f...

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Published in:arXiv.org 2021-02
Main Authors: Bohdan, Artem, Pohl, Martin, Niemiec, Jacek, Morris, Paul J, Matsumoto, Yosuke, Amano, Takanobu, Hoshino, Masahiro, Sulaiman, Ali
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container_title arXiv.org
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creator Bohdan, Artem
Pohl, Martin
Niemiec, Jacek
Morris, Paul J
Matsumoto, Yosuke
Amano, Takanobu
Hoshino, Masahiro
Sulaiman, Ali
description Collisionless shocks are ubiquitous in the Universe and often associated with strong magnetic field. Here we use large-scale particle-in-cell simulations of non-relativistic perpendicular shocks in the high-Mach-number regime to study the amplification of magnetic field within shocks. The magnetic field is amplified at the shock transition due to the ion-ion two-stream Weibel instability. The normalized magnetic-field strength strongly correlates with the Alfvénic Mach number. Mock spacecraft measurements derived from PIC simulations are fully consistent with those taken in-situ at Saturn's bow shock by the Cassini spacecraft.
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subjects Amplification
Cassini mission
Field strength
Mach number
Magnetic fields
Particle in cell technique
Saturn
Spacecraft
Weibel instability
title Magnetic field amplification by the Weibel instability at planetary and astrophysical high-Mach-number shocks
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