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Physical Review Letters – 21 January 2005
Volume 94, Issue 2

Demonstration of a wave echo in a magnetized electron-plasma vortex. The images are of density perturbations at successive times. At (a), an initial wave is excited and then dies away by Landau damping in (b) & (c). A second wave is launched at time (d), damping away in (e-g). By (h), the initial inviscid wave damping has reversed, spontaneously forming the echo shown. [J. H. Yu, T. M. O'Neil, and C. F. Driscoll, Phys. Rev. Lett. 94, 025005 (2005)]

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