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Particle Acceleration, Magnetic Field Generation in Relativistic ShocksShock acceleration is an ubiquitous phenomenon in astrophysical plasmas. Plasma waves and their associated instabilities (e.g., the Buneman instability, two-streaming instability, and the Weibel instability) created in the shocks are responsible for particle (electron, positron, and ion) acceleration. Using a 3-D relativistic electromagnetic particle (REMP) code, we have investigated particle acceleration associated with a relativistic jet front propagating through an ambient plasma with and without initial magnetic fields. We find only small differences in the results between no ambient and weak ambient parallel magnetic fields. Simulations show that the Weibel instability created in the collisionless shock front accelerates particles perpendicular and parallel to the jet propagation direction. New simulations with an ambient perpendicular magnetic field show the strong interaction between the relativistic jet and the magnetic fields. The magnetic fields are piled up by the jet and the jet electrons are bent, which creates currents and displacement currents. At the nonlinear stage, the magnetic fields are reversed by the current and the reconnection may take place. Due to these dynamics the jet and ambient electron are strongly accelerated in both parallel and perpendicular directions.
Document ID
20050163130
Document Type
Conference Paper
Authors
Nishikawa, Ken-Ichi (National Space Science and Technology Center Huntsville, AL, United States)
Hardee, P.
Hededal, C. B.
Richardson, G.
Sol, H.
Preece, R.
Fishman, G. J.
Date Acquired
August 23, 2013
Publication Date
January 1, 2005
Subject Category
Astrophysics
Meeting Information
International Workshop on Particles and Radiation from Cosmic Accelerators(Chiba)
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.