Geomagnetism: Observing Earth’s magnetic field

The Earth’s magnetic field has its origin in the molten core located ~3 000 km below the planet’s surface. Without it,
the Earth’s atmosphere would be eroded over millions of years by the solar wind – the plasma stream of charged
particles constantly escaping from the Sun. The so-called geomagnetic’ field shields our planet from this damaging
radiation and allows life on Earth as we know it to exist.

Read more