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Title:
The impact of kinetic effects on the properties of relativistic electron-positron shocks
Authors:
Stockem, Anne; Fiúza, Frederico; Fonseca, Ricardo A.; Silva, Luis O.
Affiliation:
AA( GoLP/Instituto de Plasmas e Fusão Nuclear-Laboratório Associado, Instituto Superior Técnico, Lisbon, Portugal), AB( GoLP/Instituto de Plasmas e Fusão Nuclear-Laboratório Associado, Instituto Superior Técnico, Lisbon, Portugal), AC( GoLP/Instituto de Plasmas e Fusão Nuclear-Laboratório Associado, Instituto Superior Técnico, Lisbon, Portugal; DCTI, ISCTE-Lisbon University Institute, Lisbon, Portugal), AD( GoLP/Instituto de Plasmas e Fusão Nuclear-Laboratório Associado, Instituto Superior Técnico, Lisbon, Portugal)
Publication:
Plasma Physics and Controlled Fusion, Volume 54, Issue 12, article id. 125004 (2012).
Publication Date:
12/2012
Origin:
IOP
DOI:
10.1088/0741-3335/54/12/125004
Bibliographic Code:
2012PPCF...54l5004S

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.
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