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Record Details

Record 41 of 272
Particle Acceleration, Magnetic Field Generation, and Emission in Relativistic Shocks
Author and Affiliation:
Nishikawa, Ken-IchiI.(National Space Science and Technology Center, Huntsville, AL, United States)
Hededal, C.
Hardee, P.
Richardson, G.
Preece, R.
Sol, H.
Fishman, G.
Abstract: Shock 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 (m) 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.
Publication Date: Jan 01, 2004
Document ID:
20040129493
(Acquired Oct 12, 2004)
Subject Category: ASTROPHYSICS
Report/Patent Number: Rept-5050
Document Type: Preprint
Meeting Information: Workshop on Relativistic Plasma in Magnetic Field; 16-18 Aug. 2004; Stanford, CA; United States
Financial Sponsor: NASA Marshall Space Flight Center; Huntsville, AL, United States
Organization Source: NASA Marshall Space Flight Center; Huntsville, AL, United States
Description: 1p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
NASA Terms: MAGNETIC FIELDS; PARTICLE ACCELERATION; PLASMA WAVES; RELATIVISTIC PARTICLES; SHOCK FRONTS; SPACE PLASMAS; MAGNETOHYDRODYNAMICS; PLASMA PHYSICS; SIMULATION; WEIBEL INSTABILITY; PLASMA INTERACTIONS
Availability Source: Other Sources
Availability Notes: Abstract Only
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