Magnetoacoustic Solitons in High-β Plasmas

Details Magnetoacoustic Solitons in High-β Plasmas Magnetoacoustic Solitons in High-β Plasmas

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsh53a1238s&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SH53A-1238

Other

3285 Wave Propagation (0689, 2487, 4275, 4455, 6934), 4455 Nonlinear Waves, Shock Waves, Solitons (0689, 2487, 3280, 3285, 4275, 6934, 7851, 7836 Mhd Waves And Instabilities (2149, 2752, 6050), 7852 Solitons And Solitary Waves (4455)

Scientific paper

Solitary wave solutions arise naturally from one dimensional Hall-Magnetohydrodynamic equations. These solutions have been recently identified as models for slow-mode solitary structures observed in the magnetosheath and other magnetospheric boundary layers, and as a model for magnetic holes (MH), which are localized depressions of magnetic field observed in the solar wind. We perform a parametric study of highly oblique magnetoacoustic solitons in frames of Stasiewicz's analytical model [1], taking plasma pressure anisotropy into account. We study the stability of these structures using a 1.5D hybrid code. In particular, we focus on magnetic structures in a high-β (ratio of kinetic to magnetic pressures) plasmas. These plasma conditions are typical in the region around MHs, and the study of stability is vital in verifying the theory that MHs are manifestations of such solitons. Our simulations are aimed at studying linear magnetic holes, where there is almost no variation in direction of the ambient magnetic field direction. The majority of MHs discovered in space plasmas fall into this category. [1] Stasiewicz,K., Phys. Rev. Lett., 93, 125004, 2004

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