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

 

[Huyen401]

Hi there! That's a great question. The Earth's magnetic field is actually created by the movement of the liquid outer core, not the solid inner core. So, as the outer core cools and solidifies, it would actually weaken the magnetic field. However, the inner core is constantly growing and releasing heat, which helps maintain the magnetic field. So, overall, the cooling of the core does have an effect on the magnetic field, but it is a complex and ongoing process. Hope that helps!