The bands of pink and green light were seen across the UK and in parts of Europe after an “extreme” geomagnetic storm caused them to be more visible, according to the US National Oceanic and Atmospheric Administration (NOAA).
The G5 geomagnetic storm, which is considered extreme and the strongest level of solar storm, hit Earth on Thursday. The cause of this storm was a “large, complex” sunspot cluster, 17 times the diameter of the Earth, according to the NOAA. The last storm with a G5 rating hit Earth more than 20 years ago in October 2003 and caused power outages in Sweden, Professor Carole Haswell told the BBC Radio 4 Today Programme on Saturday morning.