Quasi-parallel shock re-formation: Two-dimensional simulations

Details Quasi-parallel shock re-formation: Two-dimensional simulations Quasi-parallel shock re-formation: Two-dimensional simulations

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992esasp.346...59s&link_type=abstract

In ESA, Study of the Solar-Terrestrial System p 59-63 (SEE N93-31674 12-90)

Statistics

Computation

4

Collisionless Plasmas, Magnetic Fields, Shock Fronts, Shock Waves, Two Dimensional Models, Computational Grids, Computerized Simulation, Ion Beams

Scientific paper

Two dimensional hybrid (particle ions, massless fluid electrons) simulations are carried out in order to study the reformation process of quasi-parallel collisionless shocks. Results from a run with Alfven Mach number equal to 4.6 and angle, theta(sub beta-eta-omicron), between the average shock normal and the upstream magnetic field of 30 deg are reported. Reformation is in many cases due to steepening of upstream waves into pulsations as they are convected in the region of increasing diffuse ion density immediately upstream of the shock ramp: the upstream edge of the pulsation becomes ultimately the reformed shock. The upstream low frequency waves have their wave vectors aligned with the magnetic field, and the coherence length is about 40 ion inertial lengths. When the waves are convected into the region of increasing diffuse ion density the wave vectors are refracted into the shock normal direction. This leads to reformation which is more or less in phase along the shock front.

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