Shock front non-stationarity and ion acceleration in supercritical perpendicular shocks

Details Shock front non-stationarity and ion acceleration in supercritical perpendicular shocks Shock front non-stationarity and ion acceleration in supercritical perpendicular shocks

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsh43a1638l&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SH43A-1638

Physics

7514 Energetic Particles (2114), 7845 Particle Acceleration, 7851 Shock Waves (4455)

Scientific paper

Recently, particle-in-cell simulations demonstrated that quasi-perpendicular shocks are non-stationary and reform on gyro scale of the incoming ions. In this paper, by separating the incoming ions into the reflected and directly transmitted parts, we investigate the mechanisms of ion acceleration in non-stationary perpendicular shock. The energetic particles come from the reflected ions, and the acceleration mechanisms include shock drift acceleration (SDA) and shock surfing acceleration (SSA). In general, the final energy of SDA particles increases with the increase of their initial energy, while the final energy of SSA particles is almost independent on their initial energy. If we fix the shock profile during the different stage of the non- stationary perpendicular shock, the mechanisms of the particle acceleration will change in different profile. SDA is dominant mechanism for particle acceleration when the ramp of the shock is broad, while SSA dominates in shock with narrow shock ramp. When the shock evolves with time, the ions with lower initial energy are accelerated primary by SSA mechanism, while the ions with higher initial energy primary undergo SDA acceleration. The number of the reflected ions changes with time as the shock evolves with time, and the dynamics of particles is more complicated than in fixed shock profile.

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