Solar Flare Triggers Atlantic Radio Blackout and Northern Lights Visibility

A powerful M5.7 solar flare erupted from the sun on May 10, 2026, triggering high-frequency radio communication disruptions across the Atlantic Ocean. The eruption, which originated from sunspot region AR4436 at 9:39 a.m. EDT, caused a temporary blackout of signals essential for maritime operators, aircraft, and amateur radio users.

According to the National Oceanic and Atmospheric Administration (NOAA), the event was classified as an R2 moderate radio blackout. The disruption occurred after the solar flare ionized Earth’s upper atmosphere, which interfered with the transmission of high-frequency radio waves.

The flare was accompanied by a coronal mass ejection (CME), described as a massive release of plasma and magnetic fields from the sun’s corona. Reporting from Tempo.co indicates that this CME erupted around 1:13 p.m. On May 10, 2026, and has since been rotating into a position that faces Earth along the sun’s northeastern edge.

The US National Oceanic and Atmospheric Administration and the UK Met Office are currently monitoring the movement of the CME. Scientists anticipate that a portion of the expanding cloud of solar material could graze Earth around May 13, 2026.

Geomagnetic Storm Predictions and Aurora Visibility

Forecasters expect the CME’s arrival to trigger G1-level geomagnetic storm conditions. The G1 classification represents the lowest category on the geomagnetic storm scale, suggesting that while the impact will be relatively weak, it may still produce visible atmospheric effects.

The resulting geomagnetic activity is expected to intensify the aurora borealis, increasing the likelihood of Northern Lights sightings. Potential visibility is expected across several regions, including:

• Scotland and northern England, including potential sightings in Edinburgh.
• Parts of the northern United States.

The UK’s national meteorological service, the Met Office, noted that the current environment is influenced by the broader solar cycle. The agency stated that 2026 marks a peak year for solar activity, which increases the probability of auroras becoming visible in lower-latitude regions than is typically observed.

Technical Impact on Communication Systems

The M5.7 eruption is categorized as a moderate-to-strong level of solar activity. When such flares occur, the sudden increase in X-ray and extreme ultraviolet radiation hits the ionosphere, the layer of Earth’s atmosphere used to bounce radio signals for long-distance communication.

For the aviation and maritime industries, these blackouts can disrupt critical communication links over the Atlantic, where satellite coverage may be supplemented or replaced by high-frequency radio. Rolling Out reported that the May 10 event specifically knocked out these radio signals, creating temporary gaps in connectivity for operators in the region.

While the R2 radio blackout was temporary, the subsequent G1 geomagnetic storm provides a different set of challenges. Unlike the immediate radiation of a flare, a CME involves the physical arrival of solar particles, which can interact with Earth’s magnetic field to create the visual displays of the aurora and, in stronger cases, induce currents in power grids or satellite electronics.

Because the predicted storm is only at the G1 level, widespread technical failures are not expected, but the event highlights the sensitivity of global communication infrastructure to solar maximum conditions during the 2026 peak.