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VOLUME 86 | ISSUE 10 | PAGE 725
Nonlinear theory of mirror instability near threshold
E. A. Kuznetsov+*, T. Passot^{\nabla}, P. L. Sulem^\nabla
+P.N. Lebedev Physical Institute RAS, 119991 Moscow, Russia
*L.D. Landau Institute for Theoretical Physics RAS, 119334 Moscow, Russia
^\nablaCNRS, Observatoire de la Côte d'Azur, 06304 Nice Cedex 4, France

PACS: 52.25.Xz, 52.35.Py, 94.05.-a, 94.30.Cj
Abstract
An asymptotic model based on a reductive perturbative expansion of the drift kinetic and the Maxwell equations is used to demonstrate that, near the instability threshold, the nonlinear dynamics of mirror modes in a magnetized plasma with anisotropic ion temperatures involves a subcritical bifurcation, leading to the formation of small-scale structures with amplitudes comparable with the ambient magnetic field.


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