Electron Acceleration and Heating Influenced by Whistler Wave Packets at Quasi-Parallel Shock Waves

Details Electron Acceleration and Heating Influenced by Whistler Wave Packets at Quasi-Parallel Shock Waves Electron Acceleration and Heating Influenced by Whistler Wave Packets at Quasi-Parallel Shock Waves

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsh12c..11n&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SH12C-11

Physics

7843 Numerical Simulation Studies, 7851 Shock Waves

Scientific paper

The acceleration and heating processes of electrons at quasi-parallel shock waves are studied by means of a one-dimensional full particle computer simulation. Our simulation shows that the ion beam instability due to the anomalous cyclotron resonance excites whistler mode waves in the upstream region. When the Mach number becomes large beyond a critical value, the whistler wave packets do not appear. The electron acceleration parallel to the magnetic field results from the parallel electric fields caused by both the whistler mode waves and the electrostatic shock potential. The Mach number dependence of the potential concerning the parallel electric field exhibits different tendency on reaching the critical Mach number as to whether whistler mode waves appear in the upstream region or not. This verifies that the contribution of the whistler waves to the parallel acceleration is as important as that of the electrostatic shock potential. Also, the spatial profile of the potential concerning the parallel electric field is clearly correlated with the magnetic field profile. In the downstream region, the electron temperature tends to be anisotropic and the parallel temperature becomes larger than the perpendicular temperature. Since we cannot see the clear correlation between the parallel temperature and the macroscopic electric potential, it is concluded that the parallel heating of electrons occurs primarily owing to the wave-particle interaction (current-driven instability) rather than the adiabatic motion of electrons in the macroscopic field.

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