How to see tonight's northern lights – the strongest in 20 year

A rare geomagnetic storm not seen for nearly 20 years could cause a stunning aurora borealis on 10 and 11 May

The aurora borealis, or northern lights, are expected to be more active than they have in decades the evening of 10 May, 

according to an announcement by the US National Oceanic and Atmospheric Administration (NOAA).  

They could be visible as far south as Alabama in the US and Scotland in the UK. This marks the first severe geomagnetic storm watch from NOAA since 2005. 

This shimmering green, purple and red glow in the sky occurs when charged particles from the sun smash into Earth’s atmosphere. 

The sun emitted several huge plumes of particles, called coronal mass ejections (CMEs) between 8 and 9 May, and they are expected to reach Earth on 10 and 11 May. 

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