Oxygen acoustic solitary waves in a magnetized plasma

Details Oxygen acoustic solitary waves in a magnetized plasma Oxygen acoustic solitary waves in a magnetized plasma

Feb 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....94.1339q&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, Feb. 1, 1989, p. 1339-1346.

Physics

12

Ion Acoustic Waves, Oxygen Ions, Plasma Waves, Solitary Waves, Space Plasmas, Auroral Zones, Computerized Simulation, Hydrogen Ions, Nonlinear Equations, Wave Equations, Wave Propagation

Scientific paper

Ion-acoustic solitary waves in a magnetized plasma containing an arbitrary mixture of H(+) and O(+) ions are studied. A nonlinear wave equation has been derived from the Poisson-Vlasov equations, including a uniform magnetic field and dissipation due to reflected electrons. When dissipation is ignored, the equation has soliton solutions associated with both oxygen and hydrogen acoustic modes, which can be either rarefactive or compressive depending on the ion concentrations and the electron/ion temperature ratio and, more weakly, on the bulk drifts of the species. If electron reflection is included, the solitary wave can be intensified. Under somewhat restrictive conditions the oxygen solitary wave is rarefactive and propagates with a velocity comparable to that observed by the Viking satellite. The three-dimensional solitons obey a relation of scales parallel to the magnetic field and in the transverse direction. Computer simulations of one-dimensional versions of the nonlinear wave equation are presented.

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