Would earth go the same way as Mars by first losing its magnetic field followed by its atmosphere as its core solidifies and cools down ? At what rate is the earth's core cooling down?. Is it slow ...
Do HgMn (peculiar A type) stars really possess global magnetic fields? See, for example, this paper by Hubrig et al. from 2012.
The magnetic field activity in a star can be very chaotic and my question is are they somehow related?