Weibel-mediated Shocks Propagating into Inhomogeneous Electron–Positron Plasmas

DOI DOI Web Site Web Site 被引用文献13件 参考文献61件

書誌事項

公開日
2019-11-19
資源種別
journal article
権利情報
  • https://iopscience.iop.org/page/copyright
  • https://iopscience.iop.org/info/page/text-and-data-mining
DOI
  • 10.3847/1538-4357/ab4a10
  • 10.48550/arxiv.1907.08939
公開者
American Astronomical Society

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説明

<jats:title>Abstract</jats:title> <jats:p>The external forward shock emitting the gamma-ray burst (GRB) afterglow is collisionless, and it is mediated by the Weibel instability which generates the magnetic field. The GRB afterglow shows that the magnetic field in the large downstream region is much stronger than the shock-compressed preshock field. However, particle-in-cell (PIC) simulations of relativistic shocks propagating into homogeneous media show that the Weibel generated field decays near the shock front. Some GRB observations and theoretical studies suggest that the preshock medium is inhomogeneous. We perform the PIC simulation of a relativistic shock propagating into inhomogeneous plasma. It is found that the post-shock magnetic field decays slowly compared with the homogeneous case. Sound waves and entropy waves are also generated by the shock-wave interaction, and temperature anisotropy is produced by the sound wave in the downstream region. The free energy of the temperature anisotropy is large enough to explain the observed field strength. Our results show that the upstream density fluctuation has a significant effect in the downstream region of collisionless shocks even if the wavelength of the upstream inhomogeneity is much larger than the kinetic scale.</jats:p>

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