Computer Science – Sound
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm51c1416q&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SM51C-1416
Computer Science
Sound
2149 Mhd Waves And Turbulence (2752, 6050, 7836), 2471 Plasma Waves And Instabilities (2772), 2483 Wave/Particle Interactions (7867), 2728 Magnetosheath, 2753 Numerical Modeling
Scientific paper
Magnetic mirror instability is the slow magnetosonic wave driven unstable by the anisotropic pressure in collisionless high-β plasmas. It plays an important role in low-frequency magnetic turbulence in space plasmas. In previous analysis, it is found that the maximum growth rate increases with perpendicular wave number until the perpendicular wavelength becomes comparable to the ion-gyroradius. Therefore, the finite Larmor radius(FLR) effects are important in determining the threshold and the wavelength of the mirror instability. We have developed a general dispersion relation of the mirror mode with FLR effects. In the short wavelength limit, we find that the finite FLR effect is stabilizing. Besides, the coupling to the slow sound wave is also found to be stabilizing. Linear gyrokinetic simulation has recovered the linear dispersion relation. Nonlinear simulation will be carried out to study saturation mechanism of mirror instability
Chen Leon L.
Lin Zhangda
Qu Hang
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