Abstract
The discrepancy between the observed particle's mean free path against scattering λfit as derived from applying time‐dependent spatial diffusion models to solar particle events and the theoretical value λt from quasi‐linear theory can be resolved. A more complete quasi‐linear result for the pitch‐angle diffusion coefficient of particles in an uniform magnetic field with superposed parallel and antiparallel propagating transverse Alfvén waves yields finite and well‐behaved expressions for the mean free path λt even for rather large values of the spectral index q of the assumed power law spectrum of the power spectrum of magnetic irregularities. It is shown that values of q between 2.1 and 2.2 lead to remarkable good agreement of λt with the observed variation of λfit from solar cosmic ray events.
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