Comment on Earth’s molten core suddenly reversed direction — and scientists don’t know why
I_am_10_squirrels@beehaw.org 6 days ago
Haven’t we known for a while now that the magnetic field changes regularly? And if the magnet field is generated by the spinning of the core, it would make sense that something happened to the core rotation regularly.
supersquirrel@sopuli.xyz@sopuli.xyz 6 days ago
I don’t really know the specifics but yes, it does occasionally change, you can see evidence of this in minerals that formed in rocks that were sensitive to magnetic fields resulting in orientations that using geological context could be used to established the direction of the magnetic field.
This is about the specific granular flows of magma near the surface though, we aren’t talking about a global unified shift but rather a study that reveals that magma flows beneath the crust are much more localized, dynamic and unique to their idiosyncrasies within a human lifetime scale than the picture had suggested before.