Other
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm23a0498w&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #SM23A-0498
Other
7839 Nonlinear Phenomena, 7843 Numerical Simulation Studies, 7867 Wave/Particle Interactions, 7868 Wave/Wave Interactions, 7871 Waves And Instabilities
Scientific paper
Filaments have been observed near the bow shock and in other regions of Earth's magnetospheric plasmas. In this study, we carry out two dimensional hybrid simulations to investigate the structures and generation of filaments via interaction between the background plasma and an ion beam, whose velocity is parallel to the ambient magnetic field B0. For the case with beam density nb=0.1 and beam velocity Vb=10V_A, the simulation shows that right-hand nonresonant modes are dominant in the earlier linear stage, consistent with the linear theory prediction. In the nonlinear stage, the dynamics are, however, dominanted by two Alfven modes. While one Alfven wave mode propagates along B0, the other is obliquely propagating. In the last stage of nonlinear wave evolution, filaments corresponding to field aligned structures of magnetic field B and density N are formed. The dominant filaments have anti-phase relation between B and N, and nearly zero phase speed. Shear Alfven waves, meanwhile, remain coexisting with the filaments. The detailed mechanism for filament formation and nonlinear wave evolution will be presented.
Chen Leon L.
Lin Yangtin
Wang Xinhua
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