Nonlinear ion-acoustic (IA) waves driven in a cylindrically symmetric flow |
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| Authors: | John Z G Ma |
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| Institution: | 1.Space Science Branch,Canadian Space Agency,Saint Hubert,Canada |
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| Abstract: | By employing a self-similar, two-fluid MHD model in a cylindrical geometry, we study the features of nonlinear ion-acoustic
(IA) waves which propagate in the direction of external magnetic field lines in space plasmas. Numerical calculations not
only expose the well-known three shapes of nonlinear structures (sinusoidal, sawtooth, and spiky or bipolar) which are observed
by numerous satellites and simulated by models in a Cartesian geometry, but also illustrate new results, such as, two reversely
propagating nonlinear waves, density dips and humps, diverging and converging electric shocks, etc. A case study on Cluster
satellite data is also introduced. |
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