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Interesting show on PBS right now, NOVA: Magnetic Storm:
Like the plot of a sci-fi B movie, something weird is happening deep underground where the constant spin of Earth's liquid metallic core generates an invisible magnetic force field that shields our planet from harmful radiation in space. Gradually, the field is growing weaker. Could we be heading for a demagnetized doomsday that will leave us defenseless against the lethal effects of solar wind and cosmic rays? "Magnetic Storm" looks into our potentially unsettling magnetic future.I blame Bush!
Seriously though, losing the magnetic field would suck in a major way. Well, for those of us who are around when it happens. I plan to be long pleasantly dead. Don't worry, you will be too.
Update: Good news, people of Earth: false alarm! Looks like the worst that is going to happen is a reversal of the magnetic field, meaning your compass will point the wrong way and birds will be really confused when they fly to the North Pole for winter. Oh, to be a fly on an ice floe when that happens!
