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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.

The United Arab Emirates has announced a 10-year Blue residency visa for individuals who have made exceptional efforts and contributions to protecting the environment.

Sheikh Mohammed bin Rashid Al Maktoum, Vice President and Prime Minister of the UAE and Ruler of Dubai, who chaired the Cabinet meeting at Qasr Al Watan in Abu Dhabi formally approved this. 

He said the move comes in line with implementing the directives of President Sheikh Mohamed bin Zayed Al Nahyan, who had announced 2024 as the Year of Sustainability.

The Blue visa will be granted to individuals championing sustainability and the use of modern technologies in promoting the circular economy, and other relevant fields.

Sheikh Mohammed said the sustainability of our economy has become linked to the sustainability of our environment, and our national directions in this area are clear and consistent.

He also approved the National Youth Agenda, among several initiatives, instructing the Minister of Youth to prioritise five key areas: empowering youth economically, developing their scientific skills, reinforcing their national identity, enhancing their community contributions, and activating their role in representing their country on the international stage.

CEO of Artificial Intelligence

The Cabinet has approved the introduction of the post of CEO of Artificial Intelligence (AI) in all major federal entities, in line with the UAE's strategy to strengthen its position in AI.

“Today, we approved the introduction of the CEO of Artificial Intelligence role in all major federal entities, as part of the UAE’s strategy to solidify its position in the field of artificial intelligence,” the Vice President said.

The initiative aims to facilitate the integration of AI tools within these institutions, further advancing the transition toward a new era driven by cutting-edge technologies across federal entities.

University rankings

The Cabinet also endorsed a new framework for categorising higher education institutions across the nation. The forthcoming national rankings will assess over 70 higher education establishments based on the quality of their education, the employability of their graduates, the strength of their scientific research, and their collaborations with international scientific institutions.

The unveiling of these university rankings marks a significant stride in elevating the calibre of our higher education system and fostering transparency. It empowers families to make informed decisions, selecting the most suitable and exemplary educational pathways for their children,” Sheikh Mohammed said.

“During the meeting, we were updated on recent advancements in our national space sector, with our national cadres now comprising 38 per cent of personnel engaged in global space projects. Additionally, expenditure on space research has seen a 14 per cent increase."

"Our commitment remains steadfast in guiding our youth towards promising and pioneering sectors while safeguarding our environment and adopting leading international technologies within our government. Concurrently, we are dedicated to enhancing our higher education systems, ensuring a brighter future for our youth,” Sheikh Mohammed added.

AstraZeneca said on Tuesday it had initiated the worldwide withdrawal of its COVID-19 vaccine due to a "surplus of available updated vaccines" since the pandemic.

The company also said it would proceed to withdraw the vaccine Vaxzevria's marketing authorizations within Europe.

"As multiple, variant Covid-19 vaccines have since been developed there is a surplus of available updated vaccines," the company said, adding that this had led to a decline in demand for Vaxzevria, which is no longer being manufactured or supplied.

According to media reports, the Anglo-Swedish drugmaker has previously admitted in court documents that the vaccine causes side-effects such as blood clots and low blood platelet counts.

The firm's application to withdraw the vaccine was made on March 5 and came into effect on May 7, according to the Telegraph, which first reported the development.

London-listed AstraZeneca began moving into respiratory syncytial virus vaccines and obesity drugs through several deals last year after a slowdown in growth as COVID-19 medicine sales declined.