First ‘extreme’ solar storm in 20 years strikes earth, brings spectacular auroras

The most powerful solar storm in over two decades struck Earth on Friday, triggering spectacular celestial light shows from Tasmania to Britain — and threatening possible disruptions to satellites and power grids as it persists into the weekend.

The first of several coronal mass ejections (CMEs) — expulsions of plasma and magnetic fields from the Sun — came just after 1600 GMT, according to the National Oceanic and Atmospheric Administration (NOAA)’s Space Weather Prediction Centre.

Social media lit up with people posting pictures of auroras from northern Europe and Australasia.

“We’ve just woken the kids to go watch the Northern Lights in the back garden! Clearly visible with the naked eye,” Iain Mansfield in Hertford, England, told AFP.That sense of wonder was shared in Australia’s island state of Tasmania.

Authorities notified satellite operators, airlines and the power grid to take precautionary steps for potential disruptions caused by changes to Earth’s magnetic field.

Elon Musk, whose Starlink satellite internet operator has some 5,000 satellites in low Earth orbit, described the solar storm as the “biggest in a long time.” “Starlink satellites are under a lot of pressure, but holding up so far,” Musk posted on his X platform.

Unlike solar flares, which travel at the speed of light and reach Earth in around eight minutes, CMEs travel at a more sedate pace, with officials putting the current average at 800 kilometres per second.

“Go outside tonight and look”

Mathew Owens, a professor of space physics at the University of Reading, told AFP that how far the effects would be felt over the planet’s northern and southern latitudes would depend on the storm’s final strength.

“Go outside tonight and look would be my advice because if you see the aurora, it’s quite a spectacular thing,” he said. People with eclipse glasses can also look for the sunspot cluster during the day.

“Just go out your back door and take a picture with the newer cell phones and you’d be amazed at what you see in that picture versus what you see with your eyes.”

Spacecraft and pigeons
Fluctuating magnetic fields associated with geomagnetic storms induce currents in long wires, including power lines, which can potentially lead to blackouts. Long pipelines can also become electrified, leading to engineering problems.

Spacecraft are also at risk from high doses of radiation, although the atmosphere prevents this from reaching Earth.

NASA has a dedicated team looking into astronaut safety and can ask astronauts on the International Space Station to move to places within the outpost that are better shielded.

Following one particularly strong flare peak, the US Space Weather Prediction Centre said users of high-frequency radio signals “may experience temporary degradation or complete loss of signal on much of the sunlit side of Earth.”

Even pigeons and other species with internal biological compasses could also be affected. Pigeon handlers have noted a reduction in birds coming home during geomagnetic storms, according to NASA’s Jet Propulsion Laboratory.

Officials said people should have the normal backup plans in place for power outages, such as having flashlights, batteries and radios at hand.

The most powerful geomagnetic storm in recorded history, known as the Carrington Event after British astronomer Richard Carrington, occurred in September 1859.

Excess currents on telegraph lines at that time caused electrical shocks to technicians and even set some telegraph equipment ablaze.