Yeah but what happens when the sun blinks out?
Just to expand on that a little.
The ISS orbits from 173 to 286 miles altitude. Geostationary orbit is about 22,236 mi, and geosynchronous orbit is around 26,199 mi (major axis) -- this is where satellites go.
The magnetosphere extends out way beyond that. The guys in the ISS are close enough that they won't take the full force of the solar flare in the face.