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Generation and decay of the magnetic field in collisionless shocks

Published online by Cambridge University Press:  23 June 2017

Mikhail Garasev  and
Evgeny Derishev
Mikhail Garasev
Affiliation:
Institute of Applied Physics of the Russian Academy of Sciences, 46 Ulyanova Str., Nizhny Novgorod 603950, Russia email: garasev@appl.sci-nnov.ru
Evgeny Derishev
Affiliation:
Institute of Applied Physics of the Russian Academy of Sciences, 46 Ulyanova Str., Nizhny Novgorod 603950, Russia email: garasev@appl.sci-nnov.ru
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Abstract

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We present the results of numerical particle-in-cell (PIC) simulations of the magnetic field generation and decay in the upstream of collisionless shocks. We use the model, where the magnetic field in the incoming flow is generated by continuous injection of anisotropic electron-positron pairs. We found that the continuous injection of anisotropic plasma in the upstream of the shock-wave generates the large-scale, slowly decaying magnetic field that is later amplified during the passage of the shock front. In our simulations the magnetic field energy reached ~0.01 of the equipartition value, after that it slowly decays on the time scale proportional to the duration of the injection in the upstream. Thus, the magnetic field survives for a sufficiently long time, and supports efficient synchrotron radiation from relativistic shocks, e.g., in GRBs.

Keywords

shock wavesmagnetic fieldsgamma-ray burst
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S324: New Frontiers in Black Hole Astrophysics , September 2016 , pp. 62 - 65
Copyright
Copyright © International Astronomical Union 2017 

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