Physics
Scientific paper
Aug 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987phfl...30.2504c&link_type=abstract
Physics of Fluids (ISSN 0031-9171), vol. 30, Aug. 1987, p. 2504-2517.
Physics
13
Collisionless Plasmas, Plasma Dynamics, Shock Wave Interaction, Electron Plasma, Flow Velocity, Ionic Collisions, Mach Number, Solar Wind, Space Plasmas
Scientific paper
The interaction between collisionless shocks is examined from a kinetic viewpoint using computer simulations of shock collisions spanning the range of ambient plasma and shock parameters typical of the interplanetary medium. It is found that the interaction between two subcritical, perpendicular shocks is largely fluidlike with no evidence for accelerated particles. The electromagnetic fields associated with each shock, but not the plasmas, pass through each other during the collision. This interaction is due to self-consistently generated electric fields which adjust to the value needed to bring to rest the two incoming streams. The interaction between two supercritical perpendicular collisionless shocks is similar to the subcritical case, in that the electromagnetic fields associated with each shock are transmitted whereas particles are not. However, the interaction is also highly dynamic with substantial acceleration of ions. Increasing the Mach number gives rise to an increasing number of energetic particles.
Cargill Peter J.
Goodrich Charles Carson
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