Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-08-07
Astrophys.J.608:L13-L16,2004
Astronomy and Astrophysics
Astrophysics
4 pages, 6 figures - Accepted to ApJL. Revised version following recommendations of referee report. Content reduced marginally
Scientific paper
10.1086/421262
We present results from three-dimensional particle simulations of collisionless shocks with relativistic counter-streaming ion-electron plasmas. Particles are followed over many skin depths downstream of the shock. Open boundaries allow the experiments to be continued for several particle crossing times. The experiments confirm the generation of strong magnetic and electric fields by a Weibel-like kinetic streaming instability, and demonstrate that the electromagnetic fields propagate far downstream of the shock. The magnetic fields are predominantly transversal, and are associated with merging ion current channels. The total magnetic energy grows as the ion channels merge, and as the magnetic field patterns propagate down stream. The electron populations are quickly thermalized, while the ion populations retain distinct bulk speeds in shielded ion channels and thermalize much more slowly. These results may help explain the origin of the magnetic fields responsible for afterglow synchrotron/jitter radiation from Gamma-Ray Bursts.
Frederiksen Jacob Trier
Haugboelle Troels
Hededal Christian Busk
Nordlund Aake
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