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Magnetic field: why it matters

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Magnetic field: why it matters

E
European Space Agency, ESA

3 Views • Aug 19, 2015

Description

Earth's magnetic field is continuously changing. Magnetic north wanders, and every few hundred thousand years the polarity gradually flips, so that a compass would point south instead of north.

This is the second of three videos:
Magnetic field: an introduction: http://www.youtube.com/watch?v=P7nhgX0ppek
Magnetic field: why it matters
Magnetic field: learning more with Swarm http://youtu.be/Wn-BV9Zp8Pk