Electron Heating Process at Quasi-Perpendicular Shocks: Shock Parameter Dependence

Details Electron Heating Process at Quasi-Perpendicular Shocks: Shock Parameter Dependence Electron Heating Process at Quasi-Perpendicular Shocks: Shock Parameter Dependence

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsh72a0549s&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SH72A-0549

Other

7807 Charged Particle Motion And Acceleration, 7843 Numerical Simulation Studies, 7867 Wave/Particle Interactions

Scientific paper

The role of micro-instabilities in dissipation process in collosionless quasi-perpendicular shocks is investigated by the full-particles numerical simulation method. It is well-known that an anomalous dissipation is necessary in the super-critical Mach number. The reflected ions are mainly considered to produce the dissipation. Recently, the contribution of electrons are also well discussed and many waves are listed-up for the candidate of the dissipation process: ion acoustic waves, upper hybrid waves, whistler waves, and so on. In the present study, we discuss the variation of the wave types depends on both the shock parameters (shock Mach number, upstream plasma beta) and time. Here, the reflected ions again act as an important role. The distribution shape in velocity space of the reflected ions varies in time with the time period of over several times of ion gyro-period. Resultantly, different types of waves are excited because waves are excited by the interaction between the incoming electrons and the reflected ions. In the case that the temperature of the reflected ions is relative colder, ion acoustic waves are excited. On the other cases, the other type of waves are excited. In this sense, the ratio of the upstream plasma beta to Mach number is also the key parameter.

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