A quick follow-up to How would it be possible to kick start Mars's magnetic field?
For example, the Venerean atmosphere is contained by merely an induced magnetic field.
- How powerful would magnetic field need to be to contain sea-level Earth equivalent atmospheric pressure and composition as it exists today at Martian standard datum?
- If future terraforming initiatives get some greenhouse effect going on Mars, would the magnetic field need to be gradually strengthened / reinforced as the Martian atmosphere also gradually thickened? Would the atmospheric escape rate to outer space increase as it thickens, or would interaction between the ionosphere and the solar wind sufficiently strengthen induced magnetic field on its own?