Physics – Plasma Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm11b1732s&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SM11B-1732
Physics
Plasma Physics
[2728] Magnetospheric Physics / Magnetosheath, [7829] Space Plasma Physics / Kinetic Waves And Instabilities, [7839] Space Plasma Physics / Nonlinear Phenomena, [7867] Space Plasma Physics / Wave/Particle Interactions
Scientific paper
The temperature anisotropy (T⊥/T|| > 1) of ions in the magnetosheath drives the mirror instability. We perform two-dimensional (2D) and three-dimensional (3D) hybrid simulations in open boundary models to study the nonlinear mirror mode structures. In the open boundary systems, because of the propagation of EMIC waves, we can obtain clearer non-propagating mirror mode structures than those in the periodic models. We analyze the relation between the mirror instability and the magnetic peaks and dips which are peculiar magnetic structures observed in the planetary magnetosheaths and the heliosheath. In the 3D model, the mirror instability is dominant and makes the magnetic peak structures at the linear stage. In the 2D model, we obtain the clear magnetic dips at the nonlinear stage. In the 3D open model, on the other hand, we obtain the cigar-like magnetic peak structures, because of the nonlinear evolution of mirror mode structures and the symmetrical property of structures in the perpendicular directions. In these local magnetic structures, we analyze the distribution functions of the protons. In the magnetic decreases, the perpendicular velocity of the protons changes to the parallel velocity because of the conservation of the magnetic momentum. Thus we found the top-flatted distribution functions in the magnetic decreases. Based on the MHD equations, we study eigen mode structures of the mirror instability in the 2D and 3D models. We perform the parametric analyses and discussed the stability of these structures comparing with the observations in the magnetosheath.
Lee Lillian
Omura Yuji
Shoji Masatoshi
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