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• W2011267448 abstract "Until now, studies of shock drift acceleration (SDA) at fast mode collisionless shocks have been confined to particles with initial energies greater than 10 keV. We present for the first time the results of test particle calculations of the interaction of low‐energy (1–8 keV) protons with both strong and weak oblique shocks. Since it is expected that the details of the shock structure will be important, we use a one‐dimensional hybrid, fully self‐consistent simulation to provide a realistic, time‐varying model of the shock fields. We follow the evolution, in these fields, of an isotropic, monoenergetic population of particles released just upstream of the shock. Our results indicate that SDA is a viable mechanism at oblique shocks for initial energies down to those normally classified as superthermal. We find that there is a minimum initial energy below which particles are not reflected; this threshold energy increases with both θ Bn (the shock normal angle) and M A (the Alfvén Mach number), and therefore implies that superthermal ions are more readily reflected as θ Bn and/or M A decreases. We suggest that the reflection of superthermal to very mildly energetic (around 1 keV) ions at the earth's bow shock could provide an explanation for the most energetic field‐aligned beams observed in the earth's foreshock. We have compared our results with those from a simplified model of a finite width shock transition, and we find that, statistically, it provides remarkably good agreement with the hybrid simulation results. The greatest differences between the two models appear for transmitted ions whose initial energy is low (1 keV)." @default.
• W2011267448 created "2016-06-24" @default.
• W2011267448 creator A5062739432 @default.
• W2011267448 date "1987-02-01" @default.
• W2011267448 modified "2023-10-09" @default.
• W2011267448 title "Shock drift acceleration at low energies" @default.
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• W2011267448 doi "https://doi.org/10.1029/ja092ia02p01119" @default.
• W2011267448 hasPublicationYear "1987" @default.
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