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Nonlinear collisionless damping of Weibel turbulence in relativistic blast waves

Part of: Focus on Plasma Astrophysics Laboratory Astrophysics

Published online by Cambridge University Press:  30 October 2014

Martin Lemoine
Martin Lemoine*
Affiliation:
Institut d'Astrophysique de Paris, CNRS - UPMC, 98 bis boulevard Arago, F-75014 Paris, France
*
†Email address for correspondence: lemoine@iap.fr
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Abstract

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The Weibel/filamentation instability is known to play a key role in the physics of weakly magnetized collisionless shock waves. From the point of view of high energy astrophysics, this instability also plays a crucial role because its development in the shock precursor populates the downstream with a small-scale magneto-static turbulence which shapes the acceleration and radiative processes of suprathermal particles. The present work discusses the physics of the dissipation of this Weibel-generated turbulence downstream of relativistic collisionless shock waves. It calculates explicitly the first-order nonlinear terms associated to the diffusive nature of the particle trajectories. These corrections are found to systematically increase the damping rate, assuming that the scattering length remains larger than the coherence length of the magnetic fluctuations. The relevance of such corrections is discussed in a broader astrophysical perspective, in particular regarding the physics of the external relativistic shock wave of a gamma-ray burst.

Type
Research Article
Information
Journal of Plasma Physics , Volume 81 , Issue 1 , January 2015 , 455810101
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Copyright
Copyright © Cambridge University Press 2014 

References

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