A localized artificial magnetosphere for Mars

Mars has a couple of problems with regards to colonization such as lack of atmosphere, lack of magnetosphere, weak sunlight, and a few others. Of concern in this question is how to shield human colonists from all the nasty radiation?

Shielding by building habitats underground is feasible but boring. Let us assume for this question that passive dirt shielding is infeasible for whatever reason and we require some kind of active shielding.

How powerful would a magnetosphere generator need to be provide sufficient shielding for humans in above ground habitats?Â

Tech levels are near future (2100) and this shielding is just for the habitat, not the entire planet.

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A localized artificial magnetosphere for Mars

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