There have been spectacular displays of the Aurora Borealis - better known as the Northern Lights - across parts of the UK overnight.
The colourful phenomenon was visible in Scotland and Northern Ireland, but was also spotted as far south as Anglesey and Oxfordshire.
Aurora Borealis occurs when electrically-charged particles from the Sun enter the Earth's atmosphere.
Many people took to social media to share photographs of the dramatic show.
Forecasters had predicted a solar storm and good conditions for Aurora Borealis, and sightings of green, pink, purple, red and yellow lights were reported for several hours from about 20:00 GMT.
Gavin Chambers, an RSPB warden, tweeted pictures of vivid green in the sky over Lake Vyrnwy in Powys, Wales, saying: "Well worth getting back out of bed for!!"
Donna Butcher, from Staveley, Cumbria, tweeted to say she had been watching an "amazing display" with "shafts of light streaming directly towards Polaris".
Met Office space weather adviser Amanda Townsend said a "lucky combination" of conditions had made for a fantastic display.
"Once in a while the solar winds are enhanced to levels stronger than normal, with particles at higher speeds, and on this occasion it has connected really well with the Earth's magnetic field," she said.
The strongest part of the geomagnetic storm has now passed, meaning glimpses of the Aurora Borealis are likely to be available only to those in northern England and Scotland on Monday night.
You can email your pictures and video to firstname.lastname@example.org, and find out more about the Northern Lights here.