Mirror instability: From quasi-linear diffusion to coherent structures

Details Mirror instability: From quasi-linear diffusion to coherent structures Mirror instability: From quasi-linear diffusion to coherent structures

Mar 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3606103h&link_type=abstract

Geophysical Research Letters, Volume 36, Issue 6, CiteID L06103

Physics

Plasma Physics

3

Space Plasma Physics: Kinetic Waves And Instabilities, Space Plasma Physics: Nonlinear Phenomena (4400, 6944), Space Plasma Physics: Wave/Particle Interactions (2483, 6984), Magnetospheric Physics: Magnetosheath, Magnetospheric Physics: Numerical Modeling

Scientific paper

A model for the nonlinear dynamics of mirror modes near the instability threshold is presented. By matching the quasi-linear theory for the space-averaged distribution function with a reductive perturbative description of the mirror modes, the model reproduces the early-time flattening of the distribution function and the development of magnetic humps from an initial noise, in agreement with Vlasov-Maxwell numerical simulations. It suggests a possible mechanism at the origin of the mirror structures observed in planetary magnetosheaths and in the solar wind.

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