3 research outputs found
Propagation of Long-Wavelength Nonlinear Slow Sausage Waves in Stratified Magnetic Flux Tubes
The propagation of nonlinear, long-wavelength, slow sausage waves in an expanding
magnetic flux tube, embedded in a non-magnetic stratified environment, is discussed.
The governing equation for surface waves, which is akin to the Leibovich–Roberts
equation, is derived using the method of multiple scales. The solitary wave solution of the
equation is obtained numerically. The results obtained are illustrative of a solitary wave
whose properties are highly dependent on the degree of stratification
Nonlinear ion-acoustic (IA) waves driven in a cylindrically symmetric flow
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.Comment: accepted by AS