Physics – Plasma Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm22b..02u&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SM22B-02
Physics
Plasma Physics
[7827] Space Plasma Physics / Kinetic And Mhd Theory, [7829] Space Plasma Physics / Kinetic Waves And Instabilities, [7836] Space Plasma Physics / Mhd Waves And Instabilities, [7851] Space Plasma Physics / Shock Waves
Scientific paper
A full particle-in-cell (PIC) simulation study is carried out on the reformation at perpendicular collisionless shocks with a relatively low Alfven Mach number (Ma = 5). Previous self-consistent one-dimensional (1-D) hybrid and full PIC simulations have demonstrated that ion kinetics are essential for the non-stationarity of perpendicular collisionless shocks. These results showed that reflection of ions at the shock front is responsible for the periodic collapse and redevelopment of a new shock front on a timescale of the ion cyclotron period, which is called the shock reformation. Recent 2-D hybrid and full PIC simulations, however, suggested that the shock reformation does not take place at exactly-perpendicular shocks. By contrast, another 2-D hybrid PIC simulation showed that the shock reformation persists at quasi-perpendicular shocks. Although these two works seem to be inconsistent with each other, the reason is not well understood because of several differences in numerical simulation conditions. In the present study, we found that the time development of the shock magnetic field averaged over the shock-tangential direction shows the transition from the reformation to no-reformation phase. On the other hand, local shock magnetic field shows the evident appearance and disappearance of the shock front, and the period becomes longer in the no-reformation phase than in the reformation phase. The competition between the reformation and microinstabilities at the shock front will be discussed.
Kidani Yoshitaka
Matsukiyo Shuichi
Umeda Takashi
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