Upperpanel: radial dependence of the ACR oxygen flux ratio in the energy range between 9 and 23.5 MeV nucleon−1 . Data beyond 1 AU are taken from Webber et al. (1981). Middle and lower panels: temporal and radial variation of the radial gradient. The red symbols show the computations from the modelling of Strauss & Potgieter (2010).
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