Temporal evolution of a numerical simulation of θ-pinch discharge plasma densities showing radial shocks and large-amplitude toroidal perturbations (sequence starts top left to right, ends bottom left to right).

From the article:

Spontaneous Generation of a Sheared Plasma Rotation in a Field-Reversed $\theta$-Pinch Discharge
Y. A. Omelchenko and H. Karimabadi
Phys. Rev. Lett. 109, 065004 (2012)

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