Earth
spinning through the solar system,
proudly bearing a majestic magnetic field
emanating deep within its molten metallic core.
The ever-changing field
is full of fluctuations
from many sources.
Satellites observing these oscillations
let scientists identify
individual sources
creating the magnetic field.
One such source is the motion of the ocean.
As the ocean flows, the field lines feel a pull
and are dragged along a little.
The back-and-forth of the tides
cause a small wiggle in the magnetic field.
Scientists have isolated this
one small, oceanic signal,
measuring it from a satellite,
orbiting high above our spinning globe.
[ beeping ]