The Interactions Between Two Neighboring Kelvin-Helmholtz Instabilities in the MHD Plasmas

Details The Interactions Between Two Neighboring Kelvin-Helmholtz Instabilities in the MHD Plasmas The Interactions Between Two Neighboring Kelvin-Helmholtz Instabilities in the MHD Plasmas

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm23a1683l&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM23A-1683

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2724 Magnetopause And Boundary Layers, 2752 Mhd Waves And Instabilities (2149, 6050, 7836), 2784 Solar Wind/Magnetosphere Interactions, 7839 Nonlinear Phenomena (4400, 6944), 7852 Solitons And Solitary Waves (4455)

Scientific paper

The slow-mode and fast-mode Mach-cone-like plane waves are found in our two-dimensional magnetohydrodynamic (MHD) simulations of the Kelvin-Helmholtz (K-H) instability. The slow-mode and the fast-mode Mach-cone-like plane waves are generated by the constructive interferences of the slow-mode and the fast-mode waves emitted from the ridges of the surface waves. Unlike the nonlinear surface waves, these Mach-cone-like plane waves can expand away from the velocity shear layers. The development of the Mach-cone-like plane waves expanding into a neighboring velocity shear layer has been studied. From our simulation results, the Mach-cone-like plane waves will change into the turbulences after they propagate through the vortex structures generated by the neighboring velocity shear layer. Our simulation results also indicate that the Mach-cone-like plane waves can be a source to trigger a neighboring K-H instability. We found that the interactions between two neighboring K-H instabilities have dependence of the vorticities of the two neighboring velocity shears. Applications of our simulation results to the real space are also discussed in this study.

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