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Constraints on the acceleration of anomalous cosmic rays
Jokipii, J. R.
AA(Arizona, University, Tucson, AZ)
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 393, no. 1, July 1, 1992, p. L41-L43. (ApJL Homepage)
Publication Date:
Space Radiation
NASA/STI Keywords:
Particle Acceleration, Shock Wave Propagation, Solar Cosmic Rays, Solar Wind, Adiabatic Conditions, Charged Particles, Diffusion Coefficient, Oxygen
Bibliographic Code:


The recent determination of an upper limit of 0.2 pc on the distance to the source of the anomalous cosmic rays, and the implied upper limit on their age imposes a significant observational constraint on possible acceleration mechanisms. Adiabatic cooling in the expanding wind makes the constraints significantly more stringent. In the light of these constraints, the rate of second-order Fermi acceleration is much too low to play a significant role. Diffusive shock acceleration, even at the strong termination shock of the solar wind, is sufficient only if one discards the standard expression for the maximum acceleration rate based on the Bohm limit. Only diffusive acceleration at the quasi-perpendicular solar wind termination shock has a high enough acceleration rate to be the source of the anomalous component.

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