Macroparticle simulation of collisionless parallel shocks generated by solar wind and planetary plasma interactions

Details Macroparticle simulation of collisionless parallel shocks generated by solar wind and planetary plasma interactions Macroparticle simulation of collisionless parallel shocks generated by solar wind and planetary plasma interactions

Apr 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996jgr...101.7647s&link_type=abstract

Journal of Geophysical Research, Volume 101, Issue A4, p. 7647-7658

Physics

Plasma Physics

5

Magnetospheric Physics: Solar Wind Interactions With Unmagnetized Bodies, Interplanetary Physics: Planetary Bow Shocks, Space Plasma Physics: Shock Waves, Space Plasma Physics: Wave/Particle Interactions

Scientific paper

An implicit-particle simulation of the collisionless parallel shock created at the interface between an injected beam and a stationary plasma is performed in one-dimensional geometry. The solar wind plasma, which consists of ions and electrons, is injected into a stationary dense plasma that corresponds to the planetary ionosphere. Electromagnetic waves with right-hand circular polarization that propagate upstream (R- waves) are generated at the interface of the two plasmas, which decelerate the solar wind to form a shock. The shock transition region is not monotonic but consists of two distinct regions, a pedestal and a shock ramp. The transition region, which contains the ionopause, is a few thousand electron skin depths long. The parallel shock varies in time and periodically collapses and re-forms. The right-hand circularly polarized electromagnetic waves that propagate downstream (R+ waves) are excited at the shock ramp. Nonlinear wave-particle interaction between the solar wind and the R+ waves causes wave condensation and density modulation. These R+ waves may be sweeping away the downstream plasma to suppress its thermal diffusion across the shock. The electrons at the shock ramp exhibit a flat-topped velocity distribution along the magnetic field owing to the ion acoustic-like electrostatic waves.

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