Electron Acceleration and Structure in the Quasi-perpendicular Collisionless Shock

Details Electron Acceleration and Structure in the Quasi-perpendicular Collisionless Shock Electron Acceleration and Structure in the Quasi-perpendicular Collisionless Shock

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aipc..781...17b&link_type=abstract

THE PHYSICS OF COLLISIONLESS SHOCKS: 4th Annual IGPP International Astrophysics Conference. AIP Conference Proceedings, Volume

Astronomy and Astrophysics

Astrophysics

Shock Waves, Acceleration, Plasma Simulation, Planetary Bow Shocks, Interplanetary Shocks, Particle Acceleration, Shock Waves And Discontinuities

Scientific paper

Electron acceleration at quasi-perpendicular shocks is a key problem in collisionless shock physics, in the context of the Earth's bow shock and other astrophysical situations. Fast Fermi acceleration, or reflection by adiabatic mirroring is a robust mechanism, but predicts that the highest energies are produced over a very small shock angle range, close to perpendicular where the reflected flux is decreasingly small. Pitch angle scattering has been shown to be effective in broadening the parameter range where this process is important. Using 2D hybrid simulations and electron test particle simulations, we show that ripples and oscillations of the shock surface are efficient scatters of suprathermal electrons. The results indicate that power law energy distributions can be obtained for both upstream and downstream energetic electrons, over a reasonably wide range of shock angles.

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