Mars used to have a geomagnetic field, but it waned into nothingness about four billion years ago; Venus, meanwhile, may have never had one at all – the scientific jury is still out.

A geomagnetic storm is a disturbance of the Earth's magnetic field, typically triggered by solar activity on the sun. On a scale of G1 to G5, the SWPC predicted a G4, which was reached earlier ...

The geomagnetic field, generated by the convecting motions of Earth’s liquid outer core, is a fundamental facet of our planet’s evolution. Its long‐term behaviour is recorded in rocks ...