Does the earth's magnetic field get stronger

C&L

Hello I have a question.

Does the earth's magnetic field get stronger if the core and the outer core gets cool and solidify with time? Or the cooling of the core has no effect on it?

Maybe a naive question, but, i don't know much xd

Nik_2213

If current notions of how the geo-dynamo works hold, IIRC, it is circulation of the outer core which drives it. When that solidifies, the Earth's magnetic field would drop to 'Martian' levels, and we'd be in a world of hurt...

The inner core is already solid. Uh, I must wonder if, in addition to radioactive decay, Lunar tides help to keep the outer core liquid and stirred...

http://en.wikipedia.org/wiki/Structure_of_the_Earth