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Title: The impact of kinetic effects on the properties of relativistic electron-positron shocks
Authors: Stockem, A.
Fiuza, F.
Fonseca, R. A.
Silva, L. O.
Issue Date: 2012
Publisher: IOP Publishing Ltd
Abstract: We assess the impact of non-thermally shock-accelerated particles on the magnetohydrodynamic (MHD) jump conditions of relativistic shocks. The adiabatic constant is calculated directly from first-principles particle-in-cell simulation data, enabling a semi-kinetic approach to improve the standard fluid model and allowing for an identification of the key parameters that define the shock structure. We find that the evolving upstream parameters have a stronger impact than the corrections due to non-thermal particles. We find that the decrease in the upstream bulk speed result in deviations from the standard MHD model up to 10%. Furthermore, we obtain a quantitative definition of the shock transition region from our analysis. For Weibel-mediated shocks the inclusion of a magnetic field in the MHD conservation equations is addressed for the first time.
Description: WOS:000312579500058
Peer reviewed: yes
DOI: 10.1088/0741-3335/54/12/125004
ISSN: 0741-3335
Appears in Collections:CTI-RI - Artigos em revistas científicas internacionais com arbitragem científica

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