Contour plots showing the temporal evolution of the omni-directional differential intensity, in the equatorial plane, for the third event of Figure 3. The labelled symbols indicate the position of the six virtual observers assumed in the model. The first frame (579.0 min) shows the peak intensity reaching 0.3 AU while frames 2 and 3, both 6 min apart, show the effect of perpendicular diffusion. The last frame (~11 min later) shows the decay phase at 1 AU.