Journal
ASTROPHYSICAL JOURNAL
Volume 858, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.3847/1538-4357/aaba7a
Keywords
acceleration of particles; cosmic rays; plasmas; shock waves
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Funding
- RIKEN Advanced Institute for Computational Science through the HPCI System Research Project [hp150263]
- JSPS KAKENHI [17H02877]
- Information Technology Center, Nagoya University through the HPCI System Research Project [hp170158]
- Grants-in-Aid for Scientific Research [17H02877] Funding Source: KAKEN
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We investigated the precursor wave emission efficiency in magnetized purely perpendicular relativistic shocks in pair plasmas. We extended our previous study to include the dependence of upstream magnetic field orientations. We performed two-dimensional particle-in-cell simulations and focused on two magnetic field orientations: the magnetic field in the simulation plane (i.e., in-plane configuration) and that perpendicular to the simulation plane (i.e., out-of-plane configuration). Our simulations in the in-plane configuration demonstrated that not only extraordinary but also ordinary mode waves are excited. We quantified the emission efficiency as a function of the magnetization parameter se and found that the large-amplitude precursor waves are emitted for a wide range of se. We found that especially at low se, the magnetic field generated by Weibel instability amplifies the ordinary mode wave power. The amplitude is large enough to perturb the upstream plasma, and transverse density filaments are generated as in the case of the out-of-plane configuration investigated in the previous study. We confirmed that our previous conclusion holds regardless of upstream magnetic field orientations with respect to the two-dimensional simulation plane. We discuss the precursor wave emission in three dimensions and the feasibility of wakefield acceleration in relativistic shocks based on our results.
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