Abstract
Shocks are believed to be the primary accelerator of charged particles in space. This chapter reviews the basic theory and observations in near-Earth space. It discusses the Fermi and diffuse ion acceleration mechanisms including the self-consistent quasilinear theory. Some remarks on super-diffusion are included, stressing that super-diffusion takes place only at times shorter than binary collision time. Substantial space is provided for the discussion of particle injection based on observation and numerical simulation. Electron acceleration at shocks fills a long subsection. The nonlinear generation of high-energy tails on the electron distribution is discussed referring to shock particle simulations.
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Notes
- 1.
We do not treat relativistic shocks in the present treatise. Inclusion of relativistic effects changes the structure of shocks substantially as also the acceleration of particles. Relativistic flows are already high speed with velocity close to c, thus acceleration implies gain in momentum and energy, and readily leads to particle creation and other effects which do not allow to separate anymore between fields and particles.
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Balogh, A., Treumann, R.A. (2013). Particle Acceleration. In: Physics of Collisionless Shocks. ISSI Scientific Report Series, vol 12. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-6099-2_7
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