A trio of major solar flares could spell trouble for Earth on Friday 13th, scientists have warned.
The solar events, captured on film by Nasa, caused communications blackouts on Tuesday lunchtime - and there may be further consequences tomorrow.
"Impacts from this activity were short-lived and affected high-frequency communications for the daylit side of Earth at the time of the flare," said a statement on the National Oceanic and Atmospheric Administration (NOAA) website.
"A Coronal Mass Ejection associated with the activity has been observed moving at a flank from Earth and a glancing blow to Earth from this event is expected on June 13."
The three solar flares emitted this week. Pic: Nasa A Coronal Mass Ejection releases vast amounts of matter and electromagnetic radiation - resulting in a threat to high-frequency communication systems used by weather stations, aviators, government time stations and international shortwave broadcasters, among others.
Nasa says GPS can also be affected by solar flares.
"Harmful radiation from a flare cannot pass through Earth's atmosphere to physically affect humans on the ground," the organisation's website says.
A Coronal Mass Ejection could hit earth tomorrow. Pic: Nasa "However, when intense enough, they can disturb the atmosphere in the layer where GPS and communications signals travel."
The solar flares - caused by the build-up of magnetic energy in the sun's atmosphere - are thought to be among the most powerful of the current 11-year solar cycle.
The NOAA has warned of "continuing chances" of further flares in the near future - some of which could be even more powerful.
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