Before we get started, let’s have a cheer for Earth’s magnetic field! I would guess most of you never give it a second thought, unless you’re watching the Northern Lights or maybe using a compass. However, things would be very different on Earth if we didn’t have a magnetic field. But some people fear that the Earth’s magnetic field might be headed for a big change that could bring chaos to modern society, but are their fears well-founded?
To tackle that question we need to start with a different one: What generates Earth’s magnetic field anyway?
It is a dynamo!
