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.
01:59the entire planet can be detected by the energy of the air.
02:00The internet is truly a nuisance of light.
02:02The entire planet is extremely high.
02:04You can see that it's a new system,
02:06which is the global dynamic of the earth.
02:07The gather in the wind itself has very nice,
02:08And the next planet is passion to energy.
02:09The tunnel is a number of geomorphism and a massive silenium.
02:11The tunnel is one of the newlywastee,
02:13and the tunnel is a new system.
02:14The tunnel is an railway which is a new system.
02:15And the tunnel is a new system,
02:17which is the main theme of the cloud.
02:18The tunnel is the tunnel.
02:19The tunnel is a new system.
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