Shock drift acceleration at low energies

Details Shock drift acceleration at low energies Shock drift acceleration at low energies

Feb 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92.1119b&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, Feb. 1, 1987, p. 1119-1130.

Astronomy and Astrophysics

Astronomy

27

Astronomical Models, Oblique Shock Waves, Particle Interactions, Proton Energy, Shock Wave Interaction, Solar Terrestrial Interactions, Magnetic Flux, Particle Trajectories, Planetary Atmospheres, Solar Planetary Interactions, Solar Wind

Scientific paper

Results of test particle calculations of the interaction of low-energy (1 to 8 keV) protons with oblique fast-mode collisionless shocks are presented. A one-dimensional hybrid self-consistent simulation was used to provide a realistic time-varying model of the shock fields and to follow the evolution, in these fields, of an isotropic monoenergetic population of particles released just upstream of the shock. It is shown that shock drift acceleration is a viable mechanism at oblique shocks for particles with initial energies down to those normally considered superthermal. The results indicate that there is a minimum initial energy below which particles are not reflected. This threshold energy increases with the shock normal angle and the Alfen Mach number. A qualitative explanation for this behavior is presented. The results from the hybrid simulation agreed well with those provided by a simplified model of a finite-width shock transition. The greatest differences between the two models appear for transmitted ions with low (1 keV) initial energy.

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