The Role of Modified Two-Stream Instability for Self-Reformation and Ion Acceleration in Quasi-Perpendicular Shocks

Details The Role of Modified Two-Stream Instability for Self-Reformation and Ion Acceleration in Quasi-Perpendicular Shocks The Role of Modified Two-Stream Instability for Self-Reformation and Ion Acceleration in Quasi-Perpendicular Shocks

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsh41a0299m&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SH41A-0299

Physics

7807 Charged Particle Motion And Acceleration, 7827 Kinetic And Mhd Theory, 7839 Nonlinear Phenomena (4400, 6944), 7851 Shock Waves (4455), 7867 Wave/Particle Interactions (2483, 6984)

Scientific paper

A number of one-dimensional full particle simulations of high Mach number quasi-perpendicular shocks are performed to investigate roles of modified two-stream instability (a microscopic process) in a self-reformation process (a macroscopic process). Spatial and temporal scales of self-reformation processes significantly increase with amplitude of small scale waves generated by modified two-stream instatility in the foot. Furthermore, an influence of the increase of the scales on maximum ion energy attained during one reformation cycle is not negligible. Based on the simulation results a mechanism for the above mentioned scale variation of the self-reformation process and the resulting variation of the maximum attainable ion energy in the foot region is proposed. This mechanism is based on scattering of some of the reflected ions by the waves produced by the modified two-stream instability in the foot and subsequently reflected at the ramp and/or downstream.

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