Gyrokinetic Theory and Simualtion of Mirror Instability

Details Gyrokinetic Theory and Simualtion of Mirror Instability Gyrokinetic Theory and Simualtion of Mirror Instability

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm23a0471q&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SM23A-0471

Computer Science

Sound

2752 Mhd Waves And Instabilities, 2753 Numerical Modeling, 2772 Plasma Waves And Instabilities

Scientific paper

Magnetic mirror instability plays an important role in low frequency magnetic turbulences in high-beta space plasmas, e.g., the Earth's magnetosheath, and also potentially in high-beta laboratory mirror or dipole plasmas with large fraction of trapped particles. A quasi-hydrodynamic analysis of kinetic mirror instability in non-Maxwellian plasmas recently found that the maximum growth rate increases with perpendicular wave number. Therefore, finite Larmor radius effects are important in determining the threshold and wavelength of kinetic mirror instability. In this study, we extend the kinetic theory for mirror instability to the short wavelength regime using the gyrokinetic theory and simulation. We have developed a general dispersion relation of the mirror mode with finite Larmor radius effects and arbitrary distribution functions, and have recovered the quasi-hydrodynamic results in the long wavelength limit. We find that the most unstable mode has a wavelength on the order of ion gyroradius. We also find that both the finite beta and coupling to the slow sound wave have stabilizing effects. Gyrokinetic particle simualtion will be used to benchmark these linear results and to identify nonlinear saturation mechanism.

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