Nonlinear dynamics of mirror instability

Details Nonlinear dynamics of mirror instability Nonlinear dynamics of mirror instability

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsh43a1631s&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SH43A-1631

Physics

Geophysics

2159 Plasma Waves And Turbulence, 2728 Magnetosheath, 2752 Mhd Waves And Instabilities (2149, 6050, 7836), 2772 Plasma Waves And Instabilities (2471), 4400 Nonlinear Geophysics (3200, 6944, 7839)

Scientific paper

It is shown that the main nonlinear mechanism responsible for mirror instability saturation is associated with modification (flattening) of the shape of the background ion distribution function in the resonant region. The nonlinear mode coupling effects at this stage are neglected as corrections of the higher order of smallness. In the nonlinear regime the mirror instability dispersion relation becomes of the second order in frequency. One of its roots is found to be growing. In the course of the nonlinear saturation the mirror mode spatial scales are cascading into the large spatial scales. The results of analytical calculations are compared with particle-in-cell simulations. The relevance of theoretical results to the existing satellite measurements is stressed.

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