At the far end of the scale, G5 storms have the potential to wipe out satellites, damage transformers and trigger power blackouts.
When a powerful solar storm struck in 1859, the so-called Carrington Event is said to have set telegraph wires across North America and Europe sparking.
According to NASA, it may have been the strongest solar storm to batter the planet in 500 years.
Another powerful storm occurred in May 1921, causing electrical systems to short across New York.
Tomorrow’s event is not expected to come anywhere close to these past events, thankfully.
The SWPC assured: “Impacts to our technology from a G3 storm are generally nominal.