PreadSt.
I'm not sure you're fully right about the inverse square law (ISL)!
That applies to radiation, but the solar wind and flares are particles.
They would spread out in a way that is equivalent to the ISL, but being charged will follow lines of magnetic force. So flares will tend not to go towards the solar poles.
And could the magnetospheres of the planets cast a "shadow", which could protect spacefarers?

John