Abstract
Charged particle propagation in irregular magnetic fields is investigated. Multiple small angle scattering is considered in a model field configuration. The irregular magnetic field components are specified by their energy density and autocorrelation function. The mean deviation from ideal particle direction is given explicitly. A diffusion equation with variable diffusion coefficient is established, ordinary diffusion theory is found to be valid asymptotically. Results are applied for an estimation on the range of validity of the single-particle approach to the propagation of primary cosmic ray particles at extremely high energies.
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