Two large explosions on the Sun have sent massive amounts of magnetically charged particles heading for Earth.
The Coronal Mass Ejection
(CME) can produce mesmerising patterns of green, pink, red, blue and yellow
light.
The variations in colour
are due to the type of gas particles colliding.
Their unusual close timing
and direct path toward Earth has raised concerns that GPS signals, radio
communications and power transmissions could be disrupted.
Thomas Berger, director of
the National Oceanic and Atmospheric Administration's Space Weather Prediction
Centre in the US, said: "The unique thing about this event is that we've
had two in close succession and the CMEs could possibly be interacting on their
way to Earth, at the Earth's orbit or beyond. We just don't know that
yet."
Sky-gazers should look at
around midnight to get the best chance of seeing the lights, also known as the
aurora borealis.
Some cloud and fog patches
are expected tonight but forecasters say there will also be some clear skies.
Getting away from the
artificial light of urban areas also makes viewing easier.
Nasa said its Solar
Dynamics Observatory filmed one of the CMEs, which peaked at 1.48pm (Eastern US
time) on Wednesday.
A spokesman for Nasa said:
"Solar flares are powerful bursts of radiation. Harmful radiation from a
flare cannot pass through Earth's atmosphere to physically affect humans on the
ground.
"However - when
intense enough - they can disturb the atmosphere in the layer where GPS and
communications signals travel.
"This flare is
classified as an X1.6 class flare. 'X-class' denotes the most intense flares,
while the number provides more information about its strength."
The usually high strength
of the flare prompted the National Oceanic and Atmospheric Administration's
Space Weather Prediction Centre to issue an alert.
Mr Berger added: "We
don't expect any ummanageable impacts to national infrastructure from these
solar events at this time, but we are watching these events closely."
In February, the Northern
Lights were seen as far south as Essex, south Wales, Gloucestershire and
Norfolk .

strange
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