Two-dimensional simulations of the ion/ion acoustic instability and electrostatic shocks

Details Two-dimensional simulations of the ion/ion acoustic instability and electrostatic shocks Two-dimensional simulations of the ion/ion acoustic instability and electrostatic shocks

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18.1813k&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 18, Oct. 1991, p. 1813-1816.

Physics

9

Acoustic Instability, Boundary Layer Plasmas, Electrostatics, Shock Wave Propagation, Space Plasmas, Computerized Simulation, Trapped Particles, Two Dimensional Models, Vortices

Scientific paper

A newly developed 2D electrostatic code with particle ions and Boltzmann electrons is used to investigate the details of the ion/ion acoustic instability and the structure of electrostatic shocks. The simulation results show that, for the parameters relevant to the plasma sheet boundary layer, the saturation mechanism of the ion/ion acoustic instability is ion trapping. It is also shown that the 2D structure of electrostatic shocks is considerably different from that suggested by previous 1D simulations. The main reason for this difference is the presence of shock reflected ions, which through the ion/ion acoustic instability lead to the generation of large amplitude waves in the upstream region propagating obliquely to the shock normal. These waves play an important role in the shock dissipation process.

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