00:00Earth's magnetic field protects us from harmful particles in the solar wind.
00:12It extends deep into space, but is generated deep within our planet.
00:20By using satellites to measure fluctuations in the magnetic field,
00:24scientists are gaining new insights into Earth's interior.
00:29Unlike fixed observatories on Earth's surface,
00:32satellites can measure the magnetic field both globally and in great detail.
00:37The magnetic field is generated by swirling liquid iron in the outer core,
00:41which acts like a giant dynamo.
00:44Measurements from ESA's swarm satellites have revealed a new type of wave motion
00:48mapped at the core mantle boundary.
00:55The wave oscillates around every seven years,
00:58propagating westward at 1,500 kilometers a year.
01:08Combining these observations with a computer model of the geodynamo
01:11explains the source of magnetic field variations initially detected on the ground.
01:16the magnetic field from deep in the fluid core.
01:26Future measurements from space could help us understand more about the electrical properties of the lower mantle
01:29and about the magnetic field from deep in the fluid core.
01:44This research has important implications for our understanding of the geodynamo,
01:47the structure of the outer core, and the thermal history of Earth.
01:59which is like the way we can get to the ceiling of the airflow.
02:00It's just a bit of an object.
02:01It's just a little bit of a resource to our knowledge of our animal.
02:03It's just a bit of a resource to our terminology.
02:04It's just a little bit of a loss.
02:05It's just a little bit of a barrier.
02:08Our way the water was going to become the right.
02:09The light was going to be a floating-to-nose.
02:10It was just a little bit of a flow in the field.
02:11It was also an air traffic that we were gonna grab.
02:13The latent space that we were able to deliver from just the right to build our solar system.
02:14You
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