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The largest solar storm in two decades could trigger power blackouts, satellite disruptions and vibrant Northern Lights displays across the UK tonight , scientists have warned.

The British Geological Survey (BGS) upgraded its geomagnetic forecast to the highest intensity level on Wednesday (November 12) amid an ongoing solar storm, which prompted aurora displays across the UK overnight .

It comes after a series of powerful solar eruptions hit Earth's magnetic field, triggering a rare 'G5' geomagnetic storm - the highest category on the scale used by the US National Oceanic and Atmospheric Administration (NOAA).

Geomagnetic storms are caused by solar activity interacting with the Earth's magnetic field. According to the BGS, current predictions suggest that a s

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