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An instability driven by the thermal anisotropy of a single electron speciesis investigated in a 2D particle-in-cell (PIC) simulation. This instability isthe one considered by Weibel and it differs from the beam driven filamentationinstability. A comparison of the simulation results with analytic theoryprovides similar exponential growth rates of the magnetic field during thelinear growth phase of the instability. We observe in accordance with previousworks the growth of electric fields during the saturation phase of theinstability. Some components of this electric field are not accounted for bythe linearized theory. A single-fluid-based theory is used to determine thesource of this nonlinear electric field. It is demonstrated that the magneticstress tensor, which vanishes in a 1D geometry, is more important in this2-dimensional model used here. The electric field grows to an amplitude, whichyields a force on the electrons that is comparable to the magnetic one. Thepeak energy density of each magnetic field component in the simulation planeagrees with previous estimates. Eddy currents develop, which let the amplitudeof the third magnetic field component grow, which is not observed in a 1Dsimulation.

PIC Simulations of the Temperature Anisotropy-Driven Weibel Instability: Analyzing the perpendicular mode