Because you only said "magnets" so I debunked your proposal by subsets of the set "magnets" -- first tackling the permanent kind, then electromagnets. in the b

Because you only said "magnets" so I debunked your proposal by subsets of the set "magnets" -- first tackling the permanent kind, then electromagnets. in the broad direction of using a material isolation or some kind of electromagnetic shield. Water would work as a shielding material. 6' of lunar or martian regolith would work as well. As for "some kind of electromagnetic shield" note that a huge electric charge would be relatively easy to establish, which would repel particles of like charge. However, this would cause particles of the opposite electric charge to rush towards what you're trying to shield, so that particle flow would have to be managed with a magnetic field. This has been discussed and researched since at least the 60's, actually. Managing such particle flows would involve a whole lot of engineering research and not an insignificant amount of power.