Nonlinear MHD wave propagation in the magnetosphere: A time-dependent approach

Details Nonlinear MHD wave propagation in the magnetosphere: A time-dependent approach Nonlinear MHD wave propagation in the magnetosphere: A time-dependent approach

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000jgr...10523345l&link_type=abstract

Journal of Geophysical Research, Volume 105, Issue A10, p. 23345-24888

Physics

Plasma Physics

1

Magnetospheric Physics: Mhd Waves And Instabilities, Magnetospheric Physics: Storms And Substorms, Space Plasma Physics: Kinetic And Mhd Theory, Space Plasma Physics: Nonlinear Phenomena

Scientific paper

Dynamics of nonlinear MHD wave propagation is theoretically studied in the magnetosphere. In order to examine the time-dependent propagation of arbitrary initial impulses, we adopt the approach of simple waves, which is often used in ordinary fluids. We obtain an exact solution for the velocity profile in space and time when arbitrary initial perturbations are assumed in a simplified model. These formulas enable us to investigate the characteristics of nonlinear wave propagation and its steepening process while the shock is being formed. We describe how various nonlinear impulses differentially evolve and propagate in time by assuming different timescales for a driving source.

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