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Washington, May 11: The most powerful solar storm in more than 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 Center.

It was later upgraded to an "extreme" geomagnetic storm -- the first since the "Halloween Storms" of October 2003 caused blackouts in Sweden and damaged power infrastructure in South Africa. More CMEs are expected to pummel the planet in the coming days.

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.

"Absolutely biblical skies in Tasmania at 4 am this morning. I'm leaving today and knew I could not pass up this opportunity," photographer Sean O' Riordan posted on social media platform X alongside a photo.

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 kilometers (500 miles) per second.

The CMEs emanated from a massive sunspot cluster that is 17 times wider than our planet. The Sun is approaching the peak of an 11-year cycle that brings heightened activity.

'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.

In the United States, this could include places such as Northern California and Alabama, officials said.

NOAA's Brent Gordon encouraged the public to try to capture the night sky with phone cameras even if they couldn't see auroras with their naked eyes.

"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 Center 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 that have 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.

In a humanitarian move, Spain has refused entry to a ship carrying arms from India’s Chennai to Israel to dock at one of its ports, its Foreign Minister José Manuel Albares has said.

The Denmark-flagged cargo ship Marianne Danica sailed from Chennai on April 8 when people in Gaza were observing Ramadan fasting, and was headed to the port of Haifa in Israel, according to maritime tracking portals and Spanish media.

Spain has been extremely critical of the rising civilian casualties due to the Israeli offensive in Gaza and, along with Belgium, has suspended arms exports licenses to Tel Aviv. 

Spokesperson of the Ministry of External Affairs Randhir Jaiswal, at the weekly press conference, only said that they have seen the report of the ship and will revert with more information.

Meanwhile, a source said, “Investigation will reveal if the items on board were cleared for export and if the end user is the same as reported by The Guardian because there are items that are not banned for exports.”

Speaking to reporters in Brussels on Thursday on the issue, Mr. Albares had said, “This is the first time we have done this because it is the first time we have detected a ship carrying a shipment of arms to Israel that wants to call at a Spanish port.”

“This will be a consistent policy with any ship carrying arms to Israel that wants to call at Spanish ports. The Foreign Ministry will systematically reject such stopovers for one obvious reason: the Middle East does not need more weapons, it needs more peace,” he stated.

The ship was carrying 27 tonnes of explosives according to local reports. It was to make a port call at Cartegena in Spain.
In February, Mr. Albares said that they had suspended arms export licences to Israel since October 7, which he said made them “realise” the importance of a “fair and lasting solution” to the Palestinian cause.

The incident comes amid an ongoing row between Spanish Prime Minister Pedro Sánchez’s party and his coalition partners over another ship, Borkum, that was due to dock at Cartegena port on Friday over allegations that it was carrying arms meant for Israel. However, the Spanish government has said that the arms it is ferrying are meant for the Czech Republic.

Belgium had suspended two arms export licences to Israel.

“We welcome the decision of the Spanish government to deny the transit authorisation of the vessel Marianne Danica, in accordance with Tratado (treaty) on Arms Trade and Spanish law,” Amnesty International Spain said on social media platform ‘X’.

The timing also coincides with the Israeli ground offensive inside Rafah. According to the UN Agency for Palestinian Refugees (UNRWA) at least 6,30,000 Palestinians have been forced out of Rafah since the launch of the incursion on May 7.