I've got a generally earthlike planet, but my goal is to make radiation exposure in the polar regions a much larger hazard than it is on Earth, while not being an issue in other regions. Nothing immediately lethal, but something on a level such that unshielded exposure for more than a few weeks under normal stellar activity is likely to cause health issues. Ideally this would be done while also not making space travel (outside of radiation belts at least) vastly more hazardous, but just needing a bit more mass in radiation shielding shouldn't be an issue.
My preliminary setup has the planet orbiting a G0 star at a distance of about 1.2 AU, and a magnetosphere significantly stronger than that of Earth. While I believe these factors should work in principle, I'm having difficulty with the quantitative side of things. A detailed treatment probably out of the question given the scarcity of data on extrasolar stellar activity and complexity of the interactions, but I'm just looking for a rough estimate of the factors I need.
So my question here is: does this setup seem workable within a plausible range of planetary magnetic field strength and stellar activity for a G0 star, or should I use something else?