Mini-magnetospheric-plamsa-propulsion creates a bubble of plasma around the spacecraft which the solar particle flux can push outward or inward, much like a hot air balloon in Earth's atmosphere is affected by drafts.
An M2P2 drive could enable a manned spacecraft to reach Mars in just one month, and come back in the same period of time. Nuclear thermal drives of the type that NASA is investigating are bulky, dirty, and slow in comparison! (To say nothing of the expense and political roadblocks inherent in any nuclear propulsion development program!)