Observation of the growth of a magnetic vortex in the transition layer of a mildly relativistic oblique plasma shock

Details Observation of the growth of a magnetic vortex in the transition layer of a mildly relativistic oblique plasma shock Observation of the growth of a magnetic vortex in the transition layer of a mildly relativistic oblique plasma shock

2010-03-05

arxiv.org/abs/1003.1275v1

Phys. Plasmas 17, 110701 2010

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

4 pages

Scientific paper

10.1063/1.3493627

A 2D particle simulation models the collision of two electron-ion plasma clouds along a quasi-parallel magnetic field. The collision speed is 0.9c and the density ratio 10. A current sheet forms at the front of the dense cloud, in which the electrons and the magnetic field reach energy equipartition with the ions. A structure composed of a solenoidal and a toroidal magnetic field grows in this sheet. It resembles that in the cross-section of the torus of a force-free spheromak, which may provide the coherent magnetic fields in gamma-ray burst (GRB) jets needed for their prompt emissions.

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