Physics – Plasma Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm43a2046m&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SM43A-2046
Physics
Plasma Physics
[7807] Space Plasma Physics / Charged Particle Motion And Acceleration, [7815] Space Plasma Physics / Electrostatic Structures, [7839] Space Plasma Physics / Nonlinear Phenomena, [7851] Space Plasma Physics / Shock Waves
Scientific paper
Cluster observed converging and diverging shocks in magnetosphere at the same time1. No explanations have been proposed till now. We set up a self-similar, two-fluid model, and study the features of nonlinear waves propagating along geomagnetic field lines. Well-known three shapes of nonlinear ion-acoustic solitary structures (sinusoidal, sawtooth, and spiky or bipolar) in space plasmas were obtained in both Cartesian2 and cylindrical3 geometries via analytical and numerical calculations. Importantly, not only the observed two-type shocks are obtained simultaneously in the cylindrical frame, but accompanying characteristics are illustrated, such as, two reversely propagating nonlinear waves, density dips and humps, etc. The study4~6 exposes that field-aligned plasma beams contribute to highly structured magnetospheric electric fields; the fields bring about zonal flows which are the prime mover of Cluster-measured shocks.
Hirose A.
Ma Zhibo
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