Abstract
We present a model of the coupled evolution of energetic ions and Alfvén waves, incorporating magnetic focusing, pitch‐angle diffusion, wave amplification, and a traveling ion source. Ion transport through proton‐amplified waves with non‐Kolmogorov spectra produces the contrasting three‐stage evolution of Fe/O and He/H ratios at several MeV/amu observed by Wind/EPACT in the 20 April 1998 gradual solar energetic particle event [Tylka et al., 1999].
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