Growth rates of the Weibel and tearing mode instabilities in a relativistic pair plasma

Details Growth rates of the Weibel and tearing mode instabilities in a relativistic pair plasma Growth rates of the Weibel and tearing mode instabilities in a relativistic pair plasma

2007-10-05

arxiv.org/abs/0710.1246v1

Astronomy and Astrophysics

Astrophysics

Accepted by PPCF

Scientific paper

10.1088/0741-3335/49/11/009

We present an algorithm for solving the linear dispersion relation in an inhomogeneous, magnetised, relativistic plasma. The method is a generalisation of a previously reported algorithm that was limited to the homogeneous case. The extension involves projecting the spatial dependence of the perturbations onto a set of basis functions that satisfy the boundary conditions (spectral Galerkin method). To test this algorithm in the homogeneous case, we derive an analytical expression for the growth rate of the Weibel instability for a relativistic Maxwellian distribution and compare it with the numerical results. In the inhomogeneous case, we present solutions of the dispersion relation for the relativistic tearing mode, making no assumption about the thickness of the current sheet, and check the numerical method against the analytical expression.

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