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.
01:59a由 for assessor to the artificial control will be determined by the chemical effects of the nuclear energy.
02:00And that's good to see.
02:01There are some spots on the surface of the air.
02:02The algae of the water.
02:03The algae of the air.
02:05The algae of the algae.
02:07The algae of the algae.
02:09The algae of the algae.
02:11You
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