00:07Earth's magnetic field protects us from harmful particles in the solar wind.
00:11It extends deep into space, but is generated deep within our planet.
00:19By using satellites to measure fluctuations in the magnetic field,
00:23scientists are gaining new insights into Earth's interior.
00:29Unlike fixed observatories on Earth's surface,
00:31satellites can measure the magnetic field both globally and in great detail.
00:36The 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, propagating westward at 1,500 kilometers a year.
01:07Combining these observations with a computer model of the geodynamo
01:11explains the source of magnetic field variations initially detected on the ground.
01:15As you can see, the surface is generated by theRa-Dub.
01:28The final field of the East's vibration is again likely to peak with the warm per hour,
01:29but you can see many ways of getting the music from the Earth to the ground.
01:37If you can see the vibration when you check the Moon's image of the Earth's aura and the mass on
01:39the Earth,
01:39it'll help you hear the particle itself.
01:42So, you can see that the flow is gone in or out of a single form.
01:45core. This research has important implications for our understanding of the geodynamo, the
01:52structure of the outer core, and the thermal history of Earth.
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