On the Formation of Intermediate-Mode Mach-Cone-Like Solitary Waves in the Ion-Electron Two-Fluid Plasma

Details On the Formation of Intermediate-Mode Mach-Cone-Like Solitary Waves in the Ion-Electron Two-Fluid Plasma On the Formation of Intermediate-Mode Mach-Cone-Like Solitary Waves in the Ion-Electron Two-Fluid Plasma

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsh11b1672l&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SH11B-1672

Physics

Plasma Physics

[2102] Interplanetary Physics / Corotating Streams, [2149] Interplanetary Physics / Mhd Waves And Turbulence, [7839] Space Plasma Physics / Nonlinear Phenomena, [7852] Space Plasma Physics / Solitons And Solitary Waves

Scientific paper

Lai and Lyu (2006, 2008) show that the free energy in the velocity shear layer can produce Mach-cone-like solitary waves in the magnetohydrodynamic (MHD) plasma by the constructive interference of the fast-mode waves or slow-mode waves emitting from the velocity shear layer and expanding based on their group velocities. Because the group velocity of the MHD intermediate-mode wave is exactly field-aligned, no intermediate-mode Mach-cone-like solitary wave can be found in their simulation. In this study, we examine the group velocity distribution of the fast-mode, intermediate-mode, and slow-mode waves in the ion-electron two-fluid plasma with wavelength close to the ion inertial length. We then use the group velocity distribution to construct the Mach-cone waves based on the theoretical model proposed by Lai and Lyu (2006; 2008). Our results indicate that, in addition to the fast-mode and the slow-mode Mach-cone-like solitary waves, the intermediate-mode wave can also produce Mach-cone-like solitary waves when the finite-ion-inertial-length effects are included. Application of our results to the space plasma, such as the nonlinear Alfven waves observed in the tailing edge of the high-speed solar wind streams, will be discussed.

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