Geomagnetic storm

A geomagnetic storm is when the Earth's magnetic field gets stronger, then weaker, then stronger again, over a period of a few hours or days. This is caused by charged particles from the Sun hitting our planet's magnetic field; these particles are called the solar wind. When this happens, the earth's magnetic field can be disrupted which can affect things like power grids, communication networks and satellites. People have also noticed changes in the auroras, the colorful lights that appear in the night sky near the North and South Poles.