UK Braces for Potentially Largest Solar Storm in Two Decades, BGS Issues Highest Alert

Highest Geomagnetic Alert Issued

The United Kingdom is preparing for what the British Geological Survey (BGS) has warned could be the largest solar storm to impact the planet in over two decades. On November 12, 2025, the BGS upgraded its geomagnetic forecast to the highest intensity level, signaling a significant threat of technological disruptions across the country. This follows an initial solar event that already triggered widespread aurora displays and caused minor interference with communications and GPS systems.

Scientists anticipate that a second, more powerful 'cannibal storm' is currently underway. This phenomenon occurs when a faster-moving solar eruption overtakes an earlier, slower one, merging and amplifying its magnetic power. Current predictions suggest this event has the potential to reach the maximum G5 level on the NOAA storm scale. Dr. Gemma Richardson, a BGS Geomagnetic Hazard Specialist, noted that 'Our data suggests that this event could be one of the biggest storms we've seen in 20 years.'

Potential for Widespread Technological Disruption

The anticipated solar storm carries a risk of significant impacts on both space and ground-based technologies. Key areas of concern include:

• Communication systems: Potential disruptions to radio and satellite communications.
• Global Positioning Systems (GPS): Accuracy issues and potential outages for navigation and timing services.
• Satellite operations: Risks to satellite orbits and functionality.
• Power grids: Strain on national energy infrastructure and the possibility of power blackouts.
• Aviation: Disruptions to High Frequency (HF) communications, particularly on trans-oceanic and polar routes, and increased radiation exposure for aircrew and passengers.

The initial storm already caused the largest measured geoelectric field at ground level since BGS began recording in 2012, with early indications of solar energetic particles being some of the largest since 2005. The BGS, however, cautions that the exact magnitude of the storm cannot be predicted with absolute certainty.

National Preparedness and Public Visibility

Geomagnetic storms are recognized as a primary hazard on the UK's National Risk Register, underscoring the government's focus on preparedness. The UK has a Severe Space Weather Preparedness Strategy in place, with the Met Office operating a dedicated space weather center. Internationally, the elevated solar activity has already led to NASA postponing a rocket launch.

Despite the potential for disruption, the solar activity also presents an increased chance for the public to witness the aurora borealis (Northern Lights) across the UK, particularly in regions such as Scotland, northern England, and Northern Ireland.