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Earth

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spinning through the solar system,

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proudly bearing a majestic magnetic field

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emanating deep within its molten metallic core.

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The ever-changing field

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is full of fluctuations

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from many sources.

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Satellites observing these oscillations

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let scientists identify

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individual sources

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creating the magnetic field.

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One such source is the motion of the ocean.

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As the ocean flows, the field lines feel a pull

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and are dragged along a little.

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The back-and-forth of the tides

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cause a small wiggle in the magnetic field.

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Scientists have isolated this

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one small, oceanic signal,

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measuring it from a satellite,

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orbiting high above our spinning globe.

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  [ beeping ]

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