A major constraint on the payload we can send into space is the radiation shielding, not just from solar protons but from cosmic rays. Cosmic here means they come from the... cosmos, not from our own System. Our Sun actually protects us (and Venus L2) from the weaker nucleons From Beyond Pluto. As for the stronger nuclei... well, I still dunno.
The weaker ones are still plenty annoying and they'll be affecting our Callisto mission should we get there. What might help is knowing where a ray might be coming from, statistically. I mean: why load up on that part of the hull which won't much get hit. To that end, this might help: how the rays cause ripples.
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